It is necessary_____ others when they are in trouble.[ ]A. of us to helpB. of us helpingC. for us to helpD. for us helping -初中英语-n多题

◎ 题干

It is necessary _____ others when they are in trouble.

[ ]

A. of us to help
B. of us helping
C. for us to help
D. for us helping

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◎ 解析

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◎ 知识点

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