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There are many people downstairs .What do you think A to hap

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There are many people downstairs .What do you think A to happen.B is happening.C is happened.
D was happend
B
首先呢,happen"发生"不能用于被动语态,C D排除.
第二,句中"do you think"是插入语,可以隔过去不看,what作主语,句中缺谓语,而动词不定式(to do)属于非谓语动词,即不能直接作谓语.排除A.
第三捏,根据句意知,“楼下有许多人.你认为现在发生了什么事?”“发生”这个动作是正在进行的,用现在进行时.
综上知,选B.