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题目
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?

提问时间:2020-07-25

答案
had happened:看电视(过去时)以前已经发生了(过去的过去:过去完成)
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