28. Since 1986 when the Department of Labor began to allow investment officers’fees to be based on how the funds they manage perform, several corporations began paying their investment advisers a small basic fee, with a contract promising higher fees if the managers perform well.

A. investment officers’fees to be based on how the funds they manage perform, several corporation began

B. investment officers’fees to be based on the performance of the funds they manage, several corporations began

C. that fees of investment officers be based on how the funds they manage perform, several corporations have begun

D. fees of investment officers to be based on the performance of the funds they manage, several corporations have begun

E. that investment officers’fees be based on the performance of the funds they manage, several corporations began

Be, to be, 这两个的用法一直没有搞清，刚一看到这道题， 我就感觉很晕， 到底应该是be based 还是 to be based呢？  investment officers' fees 和 fees of investment officer, 这两个有优先的么？

赫赫... Robbie还需要多练习阿。

这道题目的考点包括：

Since + 时间，主句谓语动词应该使用完成时态

Allow的用法： allow sb. to do sth. 这里allow 表示允许，allow that 后面不使用虚拟语气 ，因为这里allow表示承认

考点1 可以排除A B E

考点2 可以排除C 因为C后面be based on 首先不应该使用动词原形 因为allow that后面不跟虚拟语气从句，同时这里allow 表示承认 和句子的逻辑意思不符合

investment officers' fee 和 fees of investment officer 在GMAT中倾向于后者，但是我要说的是两个都是正确的语言表达，不能作为考试的判据

GMAT惟一不接受的是双重所有格 比方说  A of B's 这个是不接受的表达法

希望尚面的解释能够帮到你

allow that不用虚拟语气

sth. propose that ...

allow that

rule that

这个几个后面的从句都不用虚拟语气

你一说allow sb to do something, allow.....to..... 天你一说， 我就想起来了， 看来又是被一道简单题给吓到了！