【題目】—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】

試題分析:句意:我們的母親河已經(jīng)被嚴重污染了。——我們必須竭盡全力阻止污水流進河流中。此句考查的是動詞不定式作目的狀語。故答案選C。

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