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————hasbeendonetoimprovetheworkingconditions.————hasbeendonetoimprovetheworkingconditions.aAlotofbLotsofcManydMuchconditions可数么另外AB为什么不选
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————has been done to improve the working conditions.
————has been done to improve the working conditions.a A lot of b Lots of c Many d Much conditions 可数么 另外 AB为什么不选优质解答
D,OF后面要加宾语的,这里没有,成分不全,不选
————has been done to improve the working conditions.a A lot of b Lots of c Many d Much conditions 可数么 另外 AB为什么不选
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