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哪句正确itisdifficultforustounderstandit还是itisdifficultforustounderstand?为什么?

题目详情
哪句正确
it is difficult for us to understand it 还是it is difficult for us to understand?为什么?
▼优质解答
答案和解析
都对.第一句it是形式主语,真正的主语是后面的for us to understand it.第二句it是指这件事,is dificult 是系表结构,for us to understand是状语.