The instructor had gone (over) the problems (many times) (before) the students (

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问题 The instructor had gone (over) the problems (many times) (before) the students (will take) the final examination.

选项 A、over
B、many times
C、before
D、will take

答案 D

解析过去完成时和另一从句连用；先发生的事用过去完成时，后发生的事用一般过去时。改“will take”为“took”。

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