You look very tired. You late last night.
A. needn’t sit up
B. didn’t need to sit up
C. shouldn’t sit up
D. needn’t have sat up
网友回答
A. needn’t sit up
B. didn’t need to sit up
C. shouldn’t sit up
(答案→)D. needn’t have sat up
解析：考查情态动词。根据句意及时间状语，故用情态动词 + have done，needn’t have done本没有必要做，选D。