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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。
“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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