It's necessary _____ us _____blind people cross the street.[ ]A. of; to help B. to; helping C. for; to help D. for; help-初中英语-n多题

◎ 题干

It's necessary _____ us _____ blind people cross the street.

[ ]

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

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◎ 解析

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