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【题目】It is necessary _____ people to have food and water every day.
A.of
B.for
C.with

【答案】B
【解析】句意:人们每天吃食物、喝水是必须的。这是一个不定式作主语的句子结构。其基本结构是:It's +形容词+for/of sb. to do sth,即用it作形式主语,将句子真正的主语用成带to的不定式跟在后面,引出不定式的逻辑主语用介词of或for,当形容词指人的品质时,用of,当形容词指事物时,用介词for。本句中,necessary指的是事情必须,用for。故选B。

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