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There are many people downstairs .what do you think _____(ha

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There are many people downstairs .what do you think _____(happen).
There are many people downstairs .what do you think _____(ha
happened
what happened?发生了什么事
难道是 is happening?
再问: 是的,你明白这样做的原因吗?知道的话就告诉我。
再答: 明白啊,那么句子就是 something is happening 对something进行提问 就是what is happening ? do you think只是插入语 is happening 表示事情正在发生,就是现在进行时态了 明白了没有?