All that can be done ____.A.has been doneB.have been doneC.have doneD.has done-英语

题目简介

All that can be done ____.A.has been doneB.have been doneC.have doneD.has done-英语

题目详情

All that can be done ____.
A.has been doneB.have been doneC.have doneD.has done
题型:单选题难度:偏易来源:不详

答案

A
All作主语,指的是事情或抽象概念时,常用单数,谓语动词也用单数。

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