练习:
1. A of B on C at D by
2. A take B forget C feel D make
3. A stopped B created C called D mentioned
4. A soon B early C late D timely
5. A work B play C program D pain
6. A class B punishment C treatment D home
7. A doctors B teachers C parents D classmates
8. A good B useful C wrong D handy
9. A because B although C unless D so
10. A to B at C in D as
11. A though B whether C thus D how
12. A them B him C us D you
13. A numbers B studies C cases D parts
14. A stomach B head C heart D mind
15. A support B aid C assist D help
答案1.A 2.C3.C 4.A 5.D6.A 7.B 8.C9.A 10.D11.A12.A13.C14.A15.D
