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

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

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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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