We must do what we can to ____________the river ______________.A．protect; agains

题干

We must do what we can to ____________the river ______________.

A．protect; against polluting	B．stop; polluting
C．keep; being polluted	D．prevent; from being polluted

上一题下一题 0.64难度单项选择更新时间:2012-12-29 10:19:06

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