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题目内容
（河南师范大学大学英语Ⅱ）
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