-I didn't go to the art show, because I lost my ticket．
-You have borrowed mine I didn't go to see it anyway
A. would
B. need
C. could
D. must
网友回答
A. would
B. need
(答案→)C. could
D. must
解析：句意：--我没有去看艺术展，因为我的票丢了。--我没有去看，你本来能够借我的。must have done指过去一定作过某事,表示对过去的推测。could have done表示过去能够做的事而未做，根据句意故选C。