--Oh? ______ you leave ? Stay a bit longer.
-- Sorry, I’ve got an early start tomorrow morning
A．MustB．CanC． MayD．Would
A
情態(tài)動詞辨析。A. 必須；一定  B.能；能夠  C.可以 D. 會；愿意。句意：哦，你必須離開嗎？再待一會。——抱歉，我明天早晨得早點起來。結(jié)合語境可知選A為最佳答案。
句意：
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