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【题目】_____ is very dangerous to swim alone in the river.

A.ItB.This

C.ThatD.There

【答案】A

【解析】

句意:独自在河中游泳是非常危险的。

考查形式主语结构。It 它;This 这个;That 那个;There 那儿。it is adj. to do sth. “做某事是……”,it是形式主语,动词不定式做真正的主语。故选A

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