New ways have been found to prevent the river ______.A．not to be pollutedB．again

题干

New ways have been found to prevent the river ______.

A．not to be polluted	B．against polluting
C．from polluting	D．from being polluted

上一题下一题 0.4难度单项选择更新时间:2012-06-15 03:35:48

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