I’m afraid I can do nothing about it. All that can be done .A. has doneB. has been doneC.

问题补充：

I’m afraid I can do nothing about it. All that can be done .

A. has done

B. has been done

C. have done

D. were done

答案：

A. has done

(答案→)B. has been done

C. have done

D. were done

解析：句意：关于它恐怕我不能做什么了。该做的都做了。事情应该是被做，此处应用被动语态，排除A、C；All作主语，指的是事物或者抽象概念时，常用单数，这里表示一个整体，所以用单数has，排除C，故选B。