问题补充:
Today is Wednesday. He be at home. He be at school.
A. can ; can
B. can ; must
C. mustn ; must
D. mustn ; can
答案:
A. can ; can
(答案→)B. can ; must
C. mustn ; must
D. mustn ; can
解析:can能,表示某种本能的客观的能力;must必须,一定;can’t不能,不可能,can的否定式;must’t禁止。句意:今天是星期三。不可能在家。他一定在学校。