We so tired. We've only been to a party.
A. mustn't have felt
B. wouldn't have felt
C. shouldn't have felt
D. couldn't have felt
网友回答
A. mustn't have felt
B. wouldn't have felt
(答案→)C. shouldn't have felt
D. couldn't have felt
解析：本题是情态动词的考查。should（not）后接动词的完成式表示“本来（不）应该做但实际上做了”的含义。