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

試題分析：句意：為了組織廢水流進河里，我們必須做我們能做的一切事情。to keep waste water from running into rivers.表示目的，we can，后省略了do，做everything的定語，故選C。
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