题目内容
15．-Were you late for work yesterday morning？-Yes．By the time I got to the bus stop，the early bus ．（ ）
| A． | has already left | B． | is already left | ||
| C． | had already left |
分析 --昨天早晨你上班迟到了？
--是的．当我到达公共汽车站的时候，早班车已经离开了．
解答 答案：C．
根据By the time I got to the bus stop，可知到达这个动作发生在过去，早班车离开是在他们到达之前，在这里表示过去的过去，用过去完成时．过去完成时的构成：主语+had+动词的过去分词，故选C．
点评 判断动词的时态，要通过所给的时间状语、提示词或语境去判断动词存在的状态．本题根据By the time 引导的句型判断句子所使用的时态是过去完成时是解答本题的关键．
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