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We must do everything we can          waste water from running into rivers.
A.keepB.keptC.to keepD.keeping
C

试题分析:句意:为了组织废水流进河里,我们必须做我们能做的一切事情。to keep waste water from running into rivers.表示目的,we can,后省略了do,做everything的定语,故选C。
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