题目内容
18．I overslept this morning．By the time I got to the train station，the trainhad left （leave）．分析 今天早上我睡过头了．我到达火车站时，火车已经离开了．
解答 答案：had left
联系语境，根据时间状语By the time 并结合给出的动词leave可知此句表达的意思是当我到达火车站时火车已经离开了，也就是说火车离开是在我到达火车站之前的事，这属于过去完成时的用法，表示在过去某一时间或动作之前已经发生或完成的动作，也就是指"过去的过去"，常与by the time等时间状语连用；其构成是had+动词的过去分词．leave的过去分词为left，故填had left．
点评 此题完成句子的重点是考查过去完成时的运用．做题时一定要联系语境并抓住关键时间状语加以判断，最后套用时态的构成即可．
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