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【题目】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】句意:对我们来说,当我们的朋友遇到困难的时候帮助他们走出困境很有必要。结合语境可以推测本句句意是"对我们来说,当我们的朋友遇到困难的时候帮助他们走出困境很有必要.",从整体来看本题用的句型是:It's+形容词+of/for sb. +to do,由于本句中的形容词necessary 修饰事而不是修饰人表示人的品格,所以用介词for,表"对于".所以答案是D。

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