.---Would you have told him the answer had it been possible? .---I would have but I so b

问题补充：

.---Would you have told him the answer had it been possible?

.---I would have, but I so busy then.

A. had been

B. were

C. was

D. would be

答案：

A. had been

B. were

(答案→)C. was

D. would be

解析：考查时态.句意:如果可能的话,你会告诉他这个答案吗?——我会的，但是我那时正在忙。可知谓语动词表示的是过去的某种状态，故用am的过去时态was，选C。