-I didn’t go to the art show, because I lost my ticket. -Youhave borrowed mine. I didn’t g

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A. might
B. need
(答案→)C. could
D. must
解析：考查虚拟语气。Might have done sth也许做了某事；need have done 需要做，实际上却未做；could have done本可以做，实际上却未做；must have done一定做了某事；句意：—我没有去参加艺术节，因为我的票丢了。—你本可以借我的票的。我反正没有去。根据句意说明C正确。