We have no idea what air we will be breathing in the future if we anyth

题干

We have no idea what air we will be breathing in the future if we anything to stop hazy weather.

A．hadn’t done	B．didn’t do
C．haven’t done	D．don’t do

上一题下一题 0.65难度单项选择更新时间:2017-07-04 12:05:37

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