19.All that can be done .　　A.have been done B.have done C.has been done D.has done顺便,翻译一下这句话吧

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• 19.All that can be done .　　A.have been done B.have done C.has been done D.has done顺便,翻译一下这句话吧
• 19.All that can be done .　　A.have been done B.have done C.has been done D.has done
• Has all that can be done been done?为什么用HAS 不用 HAVE PEOPLE也是整体,动词用复数先换成陈述句＝all that can be done has been done主语＝all 定语＝that can be done谓语＝has been done（被动）转换成简单的主句＝all has been doneall 作为一个整体,集合名词所以用单数我的意思是为什么用HAS 不用 HAVE PEOPLE也是整体，动词用复数 that为主语的话，无论that指的是单数还是复数，谓语动词都要用单数？
• Who made Tom feel so tired?为什么用feel而不用feels?