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问题: A traffic accident ______(happen)on the road

应该填was happened还是填has happened?
请指正!非常感谢!

解答:

A traffic accident was happened on the road
因为时间已经发生了,并且对现在无影响,所以用过去式就够了
如果有影响用has happened

在这条马路上发生了一起交通事故