all that can be done been done.
all that can be done been done.
all that can be done has been done
Has all that can be done been done?
all that can be done has been done.
all that can be done has been done.中的that为
all that can be done has been done 为什么要用has,不用have
All that can be done _______(be)done
Everything that can be done has been done,___?
all ( ) can be done must be done.
has everything that can be done been done句子里的that能不能省略,为什么?如
nothing that can be done has been done 可省that吗
合并句子all can be done.all must be done