We must do whatever we can _____ the river _____ any more.A．to keep; pollutedB．t

题干

We must do whatever we can _____ the river _____ any more.

A．to keep; polluted	B．to prevent; being polluted
C．keep; polluted	D．prevent; being polluted

上一题下一题 0.64难度单项选择更新时间:2015-08-09 10:53:15

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