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、had written; left
B、were writing; has left
C、had written; had left
D、were writing; had left

答案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表示一个时间点，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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