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The classroom is dirty,snd it needs ______(clean).

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The classroom is dirty,snd it needs ______(clean).
The classroom is dirty,snd it needs ______(clean).
to be cleaned
再问: 答案是cleaning,但不是有固定 搭配的么 need to do sth
再答: cleaning 是动名词做名词用 清扫,打扫的意思,可以 to be clean 是被动语态,需要被清扫,打扫,也可以 如果只能填一个词 就是 cleaning
再问: to clean 为什么不对啊
再答: to clean ,主动形式,主语应该是 we,I 之类的,这里主语是 it,指代 the room,是房间,不是人,所以不对