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题目内容
（河南理工大学-专升本英语2）
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
A.must stay up late
B.must have stayed up late
C.was staying up late
D.has stayed up late
参考答案
