—How are things getting on?—All that can be done____.
—How are things getting on?—All that can be done____. A.has been done B.have been done C.has done D.have done 我查了语法书,书上说,谓语动词的单复数形式要根据其所代替的词的含义来确定.那么这里all不能代替things吗?代替things的话,就可以选D了啊! 选B,而不是D,打错了