--- Would you have called her up had it been possible?
--- Yes, but I busy doing my homework.
A.was B.were C.had been D.would be
--- Would you have called her up had it been possible?
--- Yes, but I busy doing my homework.
A.was B.were C.had been D.would be
A
考察时态。由问句可知所表示的是过去的事情。