【題目】-It is necessary _____ people to have food and water every day.

A. of B. for C. with

【答案】B

【解析】

試題分析:句意:人們每天吃食物、喝水是必須的。這是一個不定式作主語的句子結(jié)構(gòu)。其基本結(jié)構(gòu)是:Its +形容詞+for/of sb. to do sth,即用it作形式主語,將句子真正的主語用成帶to的不定式跟在后面,引出不定式的邏輯主語用介詞of或for,當(dāng)形容詞指人的品質(zhì)時,用of,當(dāng)形容詞指事物時,用介詞for。本句中,necessary指的是事情必須,用for。故選B。

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