is known to us all is that we should do as much as we can stop the pollution of the environment.A．It; helpB．What; to helpC．As ; to helpD．That ; help 题目和参考答案——青夏教育精英家教网——

题目内容

_____is known to us all is that we should do as much as we can ______ stop the pollution of the environment.

A．It; help

B．What; to help

C．As ; to help

D．That ; help

B

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