--Oh? you leave ? Stay a bit longer.-- Sorry I’ve got an early start tomorrow morningA.

问题补充：

--Oh? you leave ? Stay a bit longer.

-- Sorry, I’ve got an early start tomorrow morning

A. Must

B. Can

CMay

D. Would

答案：

(答案→)A. Must

B. Can

C. May

D. Would

解析：情态动词辨析。A. 必须；一定 B.能；能够 C.可以 D. 会；愿意。句意：哦，你必须离开吗？再待一会。——抱歉，我明天早晨得早点起来。结合语境可知选A为最佳答案。

句意：