题目内容
【题目】There are many people downstairs.What do you think ?
A.to happen
B.happening
C.is happened
D.has happened
【答案】D
【解析】句意:楼下有许多人,你认为发生了什么事?空格处需要作句子的谓语,AB是非谓语形式,故排除;happen是不及物动词,不可用被动语态,故C错误;has happened是现在完成时,故选D。
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