.---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
网友回答
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。