问题
选择题
It's necessary _____ us _____ blind people cross the street.[ ]
A. of; to help
B. to; helping
C. for; to help
D. for; help
答案
答案：C
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It's necessary _____ us _____ blind people cross the street.[ ]
A. of; to help
B. to; helping
C. for; to help
D. for; help
答案：C