90. 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 corporations 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（D）
(E) that investment officers’ fees be based on the performance of the funds they manage, several corporations began
突然觉得：manage 是不是应该用过去时态修饰funds?这个问题在讨论帖中没有发现，可能是太傻了，但仍渴望诸位的帮助 | 
