He would have given you more help, but he ____ so busy. A.has been B.is C.had been D.were
答案是B,为什么呢?wouldhavedone是对过去的虚拟,那busy的状态也应该是过去式的呀?...
答案是B,为什么呢?would have done 是对过去的虚拟,那busy的状态也应该是过去式的呀?
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