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【题目】________ is very difficult ________ such a high mountain.

A. This;to climb B. It;to climb C. This;climbing D. It;climbing

【答案】B

【解析】

句意:爬那么高的一座山是非常困难的。在英语中为了避免主语过长,可以用it代替动词不定式作形式主语,其结构为:it is(was)+形容词(名词)+动词不定式。故选B。

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