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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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