【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】考查介詞。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(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。故選D。

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