You look very tired. You ____ late last night.
A．needn’t sit upB．didn’t need to sit upC．shouldn’t sit upD．needn’t have sat up
D
考查情態(tài)動詞。根據(jù)句意及時間狀語，故用情態(tài)動詞 + have done，needn’t have done本沒有必要做，選D。
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