问题补充：
25. – Tom, its too late. Our son be back.
– Don be anxious. I dare say he have some extra work to do.
A. can; must
B. will; might
C. should; must
D. must; may
答案：
A. can; must
B. will; might
(答案→)C. should; must
D. must; may
解析：
25．C(解析：考查情态动词。should 按理说，应该” must “肯定”，选C。)
