高考英语单选题 情态动词
问题描述:
高考英语单选题 情态动词
While by regulations high school students ______not use cellphones in the school ,they can use public phones to keep in touch with friends and family.
A.must B.shall C.would D.might
请解释下为什么不选A
答
shall not是不应该的意思.