填空题:All that can be done_.(do) 请给出解题详情.

问题描述:

填空题:All that can be done_.(do) 请给出解题详情.

has been done
All that can be done has been done 所有能做的都做了 ,根据题意是需要过去完成时,所以答案是has been done答案是have been done.是has been done,打字错了,是现在完成时 我就不明白你怎么就会说答案是have been done.,很明显是错的啦。All that can be done是一个整体,只能是单数,这里只能是has been done