_____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 |
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_____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 |
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