Muchhasbeendonetokeeptheair_____

发布时间：2020-07-26 08:14:53

Much has been done to keep the air ________.A.from pollutingB.from being pollutedC.pollutingD.being polluted

网友回答

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．
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