what( )last night.a.happen b.happens chappened

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what()lastnight.a.happenb.happenschappenedwhat()lastnight.a.happenb.happenschappenedwhat()lastnight.

what( )last night.a.happen b.happens chappened
what( )last night.a.happen b.happens chappened

what( )last night.a.happen b.happens chappened
C.很明显,last night是说昨晚的事,因此用表示过去的时态,happened是过去完成时,其他两个选项都是一般现在时