— you leave now? You only arrived an hour ago!
—Sorry, but so much homework is waiting for me.
A. Must
B. May
C. Can
D. Might
网友回答
(答案→)A. Must
B. May
C. Can
D. Might
解析：A 考察情态动词。句义：现在必须得走吗？你一个小时前才到啊！对不起，我还有很多作业要做。Must必须，非得。May可以；can能；might可以；语气比较委婉。只有must符合语境，故A正确。