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【题目】—Our mother river has been polluted heavily.

—We must do everything we can___________ waste water from running into rivers.

A. keep B. kept C. to keep D. keeping

【答案】C

【解析】

试题分析:句意:我们的母亲河已经被严重污染了。——我们必须竭尽全力阻止污水流进河流中。此句考查的是动词不定式作目的状语。故答案选C。

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