They happened to__________ for Tianjin when we got there.

2023-04-24

[单选] They happened to__________ for Tianjin when we got there.

A . leave
B . have left
C . leaving
D . had left



参考答案:B

参考解析:

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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