题目内容
—Why was he late for school yesterday?
— He overslept. By the time he got to the bus stop, the bus ________ already ______.
| A．has; left | B．had; left | C．was; leaving | D．have; left |
B
解析试题分析：句意：昨天他为什么迟到了？——他睡过头了。他到达公交车站时，公交车已经开走了。结合语境可知下文描述的是一直持续到过去某时的动作，故用过去完成时态，选B。
考点：考查动词的时态。
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