河南成教 / 大学英语2
正确率：100%
34、
A. must stay up late
B. must have stayed up late
C. was staying up late
D. has stayed up late
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
参考答案：
佳题速递：