【題目】【2016湖北黃石】It is necessary ______ us to help our friends out when they meet difficulties.

A．to B．of C．withD．for

【答案】D

【解析】

試題分析：句意：當(dāng)朋友遇到困難時(shí)，我們幫助他們解決困難是必須的。這是一個(gè)不定式作主語(yǔ)的句子，其基本結(jié)構(gòu)是：It’s adj. for sb. to do sth；常用for引出不定式的邏輯主語(yǔ)。故選D。

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