It is well known that _________ air and water are harmful to people’s health.A．p_刷题宝

题干

It is well known that _________ air and water are harmful to people’s health.

A．pollute	B．polluting
C．to pollute	D．polluted

上一题下一题 0.64难度单项选择更新时间:2016-04-07 04:05:47

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