Social attention should be paid _______ our earth from _______.A．to prevent; bei

题干

Social attention should be paid _______ our earth from _______.

A．to prevent; being polluted	B．to prevent; polluting
C．to preventing; being polluted	D．to preventing; polluted

上一题下一题 0.64难度单项选择更新时间:2013-05-20 11:12:14

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