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【題目】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】

試題句意：當朋友遇到困難時，我們幫助他們解決困難是必須的。這是一個不定式作主語的句子，其基本結構是：It’s adj. for sb. to do sth；常用for引出不定式的邏輯主語。故選D。

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