问题描述：
When l was watching TV last night,l heard that an awful car accident()(happen)in the city center.
是填happen还是has happened还是had happened?
上面那个问句是错的,
是填happened还是has happened还是had happened?
是填happen还是has happened还是had happened?
上面那个问句是错的,
是填happened还是has happened还是had happened?
问题解答：
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