Did you see the game?NO I didn't I ____visit my grandparents at that timeA happened to B was happen C happen to D happened

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Didyouseethegame?NOIdidn''tI____visitmygrandparentsatthattimeAhappenedtoBwashappenChappentoDhappenedD

Did you see the game?NO I didn't I ____visit my grandparents at that timeA happened to B was happen C happen to D happened
Did you see the game?NO I didn't I ____visit my grandparents at that time
A happened to B was happen C happen to D happened

Did you see the game?NO I didn't I ____visit my grandparents at that timeA happened to B was happen C happen to D happened
选A happen to do 碰巧发生,碰巧在做……
要用过去时

答案选A happened to 碰巧,刚好
这里要用过去时态,表示事情发生在过去。

答案选择A
1根据前文是一般过去时态
2.happen没有被动语态