问题补充:
—Will you stay for some more days?
—Sorry, I. My mother called to ask me to go back at once.
A. mustn’t
B. may not
C. can’t
D. wouldn’t
答案:
A. mustn’t
B. may not
(答案→)C. can’t
D. wouldn’t
解析:情态动词表推测。句意:-你再呆几天好吗?-对不起,我不能,我的母亲打电话让我马上回去。Mustn’t禁止;may not可能不;wouldn’t不愿做……,将要不……。故选C。