2. 介宾短语中宾语数量错误
介宾短语=介词+宾语，这个成分可以用来作定语，状语，表语和补语。在IE中多以as...作补足语形式出现，as后面所接名词的数量与前文不符。
2009.5
In the early twentieth century, telephone companies (supported) the (cause of) financial independence for woman (by providing )many with respectable jobs as (a switchboard operator).
解析：时间状语是20世纪早期，因此supported时态正确，短语cause of...和support...by doing正确，最后一个选项中as...介词短语作宾补，因此需要和jobs数量一致。答案D。
2009.10
Throughout the season he coach (would often )remind us that the best teammates are not those who strive to set individual records (but those )who fit in as (a member )of a cohesive unit.
解析：这里B,C答案中的but those和not those平行，所以排除，would often时态正确，A排除，而fit in as a member中as a member是介宾短语作补足语，因此宾语在数量上必须和主语who一致，故改成as members.
IS考过介词from后面接宾语数量错误的形式：
2007/10
Those enrolled in the leadership training courses have evolved into dynamic, confident managers,( from an inexperienced and uncertain newcomer )just a month ago.
(A) from an inexperienced and uncertain newcomer
(B) from the inexperienced and uncertain newcomers they were
(C) from being inexperienced and uncertain newcomers
(D) instead of the inexperienced and uncertain newcomers of
(E) after being an inexperienced and uncertain newcomer
答案：B
2009.1
The second-year students at this college have evolved into insightful, critical thinkers( from an inexperienced and uncertain teenager just a year before).
(A) from an inexperienced and uncertain teenager just a year before
(B) from the inexperienced and uncertain teenagers they were just a year ago
(C) even though just a year before they were an inexperienced and uncertain teenager
(D) in just a year from an inexperienced and uncertain teenager
(E) when in just a ear they were inexperienced and uncertain teenagers
答案：B
这两题用了同一个短语Sb. evolves/evolve from A to B，在这个句型里A和B需要数量一致。
