【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)不定式作主語的句子,其基本結(jié)構(gòu)是:Its 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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