52单词网 > 高中英语 > 高中英语题库 > Much has been done to keep the air . [ ] A．from pollutingB．from being polluted C

Much has been done to keep the air . [ ] A．from pollutingB．from being polluted C

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Much has been done to keep the air . [ ] A．from pollutingB．from being polluted C

Much has been done to keep the air ________.

[]

A．from pollutingB．from being pollutedC．pollutingD．being polluted

试题答案

答案：B

解析：

【巧解导析】“the air”与“pollute”的关系为被动关系，排除A，C项；而D项的含义与句意不符合．Keep表示“阻止”的含义时，其后的from不能省略．

提示：

【巧解点悟】“阻止……做某事”的表达法还有stop/prevent sb from doing sth这些结构．但其后的from可以省略．

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