there are many people downstairs.what do you think_________? a.to happen b.happening c.is happenedd.has happened

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there are many people downstairs.what do you think_________? a.to happen b.happening c.is happenedd.has happened
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there are many people downstairs.what do you think_________? a.to happen b.happening c.is happenedd.has happened
there are many people downstairs.what do you think_________? a.to happen b.happening c.is happened
d.has happened

there are many people downstairs.what do you think_________? a.to happen b.happening c.is happenedd.has happened
A to表示事情还没发生,即将要发生
B 现在进行时,一般事情发生的是短暂性的,不可能一直发生中
C 则是被动语态,被发生不合常理
D正确 你觉得已经发生了什么事,用完成时

d哦。。完成时。

选择d. do you think 作为一个插入语,可以删掉,分析句子,缺少谓语,a、b排除,根据句义,句子为主动时态“发生了什么”c为被动时态,所以选择d.
希望能够帮到你!