China's present environment situation is from bad to worse and if we _________ n

题干

China's present environment situation is from bad to worse and if we _________ now to protect the environment, we’ll live to regret it.

A．hadn’t acted

B．haven’t acted

C．don’t act

D．won’t act

上一题下一题 0.64难度单项选择更新时间:2014-01-28 05:00:41

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