---I failed to catch the early bus because I overslept this morning． ---Youhave stayed up

问题补充：

---I failed to catch the early bus because I overslept this morning．

---Youhave stayed up too late last night．

A. could

B. would

C. should

D. must

答案：

A. could

B. would

C. should

(答案→)D. must

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