The policeman happened ______ the traffic when the accident happened.

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问题 The policeman happened ______ the traffic when the accident happened.

选项 A、to direct
B、directing
C、to be directing
D、to have directed

答案C

解析 happen后接不定式，表示正在进行时，用C的结构，答案为C。

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公共英语二级笔试

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