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I don't know whether you happen_____ but I'm going to study i n the US A.to have heard 为什么?
人气:439 ℃ 时间:2020-04-07 08:11:13
解答
happen 后面加动词要用happen to do sth.表示碰巧做某事,现在完成时表示事情已经发生并对现在仍有影响.
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