翻译：今天已经做完了四分之三的家庭作业.
homework是不可数名词,所以用has,而不用have.
Three fourths of the homework has been done today 为什么不用have?
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Three fourths of the homework _________ today. A．has done B．
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Three fourths of the homework _______ today. A．has finished
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Three-fourths of the homework ______today.a.have finished b.
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three fourths of the homework have finished 怎么理解 用have finis
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all that can be done has been done 为什么要用has,不用have
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done,tobe done,to have been done,to have done,having done,ha
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（）has recently been done toimprove the condition of、、、、
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has been doing have been done区别
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有关英语语法have donehave been done has done had done这些属于什么?has/ha