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【题目】It is necessary ________ us to help our friends out when they meet difficulties.

A. to B. of C. with D. for

【答案】D

【解析】

试题句意:当朋友遇到困难时,我们帮助他们解决困难是必须的。这是一个不定式作主语的句子,其基本结构是:It’s adj. for sb. to do sth;常用for引出不定式的逻辑主语。故选D

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