问题
选择题
All that can be done ____.
A．has been done
B．have been done
C．have done
D．has done
答案
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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All that can be done ____.
A．has been done
B．have been done
C．have done
D．has done
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。