-Our mother river has been polluted heavily．-We must do everything we can waste water from running into rivers．( )A．keepB．keptC．to keepD．keeping 题目和参考答案——青夏教育精英家教网—

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4．-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

分析 --我们的母亲河已经受到了严重的污染．
--我们必须尽我们一切所能来阻止废水流入河中．

解答答案：C．
本题考查非谓语动词的用法．根据语境推测答语的句意是"我们必须尽我们所能来阻止废水流入河中．"，即设空处动词表目的，应该使用动词不定式，注意设空处前面的do everything we can意思是"尽我们一切所能"，后面跟动词不定式作目的状语，所以选C．

点评本题考查非谓语动词的用法，抓住句中的关键词并联系相关的语法知识可得出正确的答案．平时注意对此类短语或句式用法的总结与归纳．

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