【題目】________ 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難的。在英語(yǔ)中為了避免主語(yǔ)過(guò)長(zhǎng),可以用it代替動(dòng)詞不定式作形式主語(yǔ),其結(jié)構(gòu)為:it is(was)+形容詞(名詞)+動(dòng)詞不定式。故選B。

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