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。