13.A recent study has found that within the past few years, many doctors had elected early retirement rather than face the threats of lawsuits and the rising costs of malpractice insurance.（O.P.330）
A） had elected early retirement rather than face
B） had elected early retirement instead of facing
C） have elected retiring early instead of facing
D） have elected to retire early rather than facing
E） have elected to retire early rather than face
14. Opening with tributes to jazz-age divas like Bessie Smith and closing with Koko Taylor's electrified gravel-and thunder songs, the program will trace the blues'vigorous matriarchal line over more than 50 years. （Z.P.91）
A） the program will trace
B） the program shall trace
C） there will be a program tracing
D） it it's a program that traces
E） it will be a program tracing
15. In a period of time when women typically have had a narrow range of choices, Mary Baker Eddy became a distinguished writer and the founder, architect, and builder of a growing church. （Z.P. 102）
A） In a period of time when women typically have
B） During a time in which typically women have
C） Typically, during a time when women
D） At a time when women typically
E） Typically in a time in which women
16. During the nineteenth century Emily Eden and Fanny Parks journeyed throughout India, sketching and keeping journals forming the basis of news reports about the princely states where they had visited. （Z.P.106）
A） forming the basis of news reports about the princely states where they had
B） that were forming the basis of news reports about the princely states
C） to form the basis of news reports about the princely states which they have
D） which had formed the basis of news reports about the princely states where they had
E） that formed the basis of news reports about the princely stats they
17. Even though its per capita food supply hardly increased during two decades, stringent rationing and planned distribution have allowed the People's Republic of China to ensure nutritional levels of 2000 calories per person per day for its population. （ Z.P.109）
A） Even though its per capita food supply hardly increased during
B） Even though its per capita food supply has hardly increased in
C） Despite its per capita food supply hardly increasing over
D） Despite there being hardly any increase in its per capita food supply during
E） Although there is hardly any increase in per capita food supply for
18. Since the past twenty years, thousands of magnificent United States elms have been killed by infestations of the tiny European bark beetle. （Z.P.117）
A） Since the past twenty years
B） Since twenty years have passed
C） During the past twenty years
D） Twenty years ago
E） After twenty years
19. Developing nations in various parts of the world have amassed $700 billi on in debts; at stake, should a significant number of these debts be repudia ted, is the solvency of some of the world's largest multinational banks. （Z.P.123）
A） should a significant number of these debts be repudiated, is
B） should a significant number of these debts be repudiated, are
C） should they repudiate a significant number of these debts, are
D） if there is a repudiation of a significant number of these debts, would be
E） if a significant number of these debts will be repudiated, is
20. During the summer of 1981, when it looked like parts of new York and new Jersey were going to run short of water, many businesses and homes were affected by the stringent restrictions on the use of water. （Z.P.132）
A） it looked like parts of new York and new Jersey were going to run
B） it looked as if parts of New York and New Jersey would have run
C） it appearances that parts of New York and New Jersey would run
D） appearances were that parts of New York and New Jersey would run
E） it was the appearance that parts of New York and New Jersey would running
21. The political masters of the health care system have not listened to professional health planners because it has not been profitable for them to do that thing. （Z.P.133）
A） has not been profitable for them to do that thing
B） has not been profitable for them to do so
C） has been unprofitable for them to do that thing
D） has been unprofitable for them to do so
E） doing so had not been profitable for them
22. Few baskets made by Southern California Indians would have survived to the present had it not been for enthusiastic collectors at the turn of the century. （Z.P.134）
A） had it not been for
B） unless there had been
C） without the fact that there were
D） were it not due to
E） except that there were
23. Some buildings that were destroyed and heavily damaged in the earthquake last year were constructed in violation of the city's building code. （Z.P.157）
A） Some buildings that were destroyed and heavily damaged in the earthquake last year were
B） Some buildings that were destroyed or heavily damaged in the earthquake last year had been
C） Some buildings that the earthquake destroyed and heavily damaged last year have been
D） Last year the earthquake destroyed or heavily damaged some buildings that have been
E） Last year some of the buildings that were destroyed or heavily damaged in the earthquake had been
KEYS:
1.A know后面的that 从句说明know的内容，that一般是不省的。注意动词一般现在时的用法和含义。
2.E during the first six months of this year（在今年的头6个月里）是明确的过去时间，其所修饰的动词应用一般过去时，而during the next three months 所修饰的动词则可以用现在完成时，表示一个过去开始的但持续到将来的动作。
3.A 4.B 5.B 6.D 7.A
8.D 同一个行为，同一具主语，一般应用do so,而不用do it或do this
9.C 10.C 11.E 12.A 13.E 14.A 15.D 16.E 17. B 18.C 19.A 20.C 21.B 22.A 23.B
