汤姆失望了,因为他到达晚会时,大部分客人已经走了。
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 hardly when 还没等 就。例如:
I had hardly opened the door when I he hit me. 我刚打开门,他就打了我。
had no soonerthan 刚 就。例如:
He had no sooner bought the car than he sold it. 他刚买了这辆车,转眼又卖了。
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