They happened to ______for Tianjin when we got there.

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问题 They happened to ______for Tianjin when we got there.

选项 A、leave
B、have left
C、leaving
D、had left

答案B

解析 happen to后接动词原形，所以先排除C、D，而不定式表示的动作发生于过去，故选B。

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中学英语

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