There are many people downstairs.What do you think ______?A.to happen B.happening C.is happened D.has happened 选哪个?为什么?
人气：395 ℃ 时间：2019-08-18 12:26:25
解答
选D.do you think 是插入语,去掉以后就可以看出句中缺谓语,happen是不及物动词,不能用被动语态.
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