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2015年公共英语考试pets2语法精选练习(6)

网络2015-10-26 16:17

  过去完成时典型例题

  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

  答案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。

  注意:

  had no … when 还没等…… 就……

  had no sooner… than 刚…… 就……

  He had no sooner bought the car than he sold it.

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(实习编辑:高奕飞)



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