题目内容

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

A. had written, left          B. were writing, has left

C. had written, had left   D. were writing, had left

D


解析:

“把书忘在办公室”发生在“去取书”这一过去的动作之前,因此“忘了书”这一动作发生在过去的过去,用过去完成时。句中when表示的是时间的一点,表示在“同学们正忙于……”这一背景下,when所引导的动作发生。因此前一句应用过去进行时。

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