More and more people have come to realize that if we had taken effective measure

题干

More and more people have come to realize that if we had taken effective measures much earlier, the air quality ______ so seriously now.

A．is not polluted	B．would not be polluted
C．had not been polluted	D．would not have been polluted

上一题下一题 0.4难度单项选择更新时间:2013-05-31 08:36:50

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