[单选题,1.3分] He looks so tried this morning. He ____last night. A.must stay up late B.must have stayed up late C.was staying up late D.has stayed up late

[单选题,1.3分]
He looks so tried this morning. He ____last night.

A.must stay up late
B.must have stayed up late
C.was staying up late
D.has stayed up late

出自：河南理工大学—大学英语2

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