I can’t imagine what air we would be breathing in if we __________ anything to s

题干

I can’t imagine what air we would be breathing in if we __________ anything to stop air pollution.

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

上一题下一题 0.64难度单项选择更新时间:2015-07-29 05:22:37

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