2. 外语
  3. The students ______ busily when Miss Brown went to get a book she ______ in the office.

The students ______ busily when Miss Brown went to get a book she ______ in the office.

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问题 The students ______ busily when Miss Brown went to get a book she ______ in the office.
选项 A、were writing; has left
B、had written; left
C、were writing; had left
D、had written; had left
答案C
解析 考查时态。“把书忘在办公室”发生在“去取书”这一过去的动作之前，因此要用过去完成时。句中when表示某一时间点，某人在某一时间点做某事，用过去进行时。因此主句应该用过去进行时。故答案为C。
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