It is so late. Our son be back . Don’t worry . I dare say he have some extra work to d

问题补充：

It is so late. Our son be back .

Don’t worry . 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

(答案→)B. will ; might

C. should ; must

D. must ; may

解析：考查情态动词。Will在这里表示推测，可能，想必，might have done,表示对过去可能性的推测。句意：如此的晚了，我们儿子这时候会回来的。别担心，我敢说他可能有一些额外的工作要做。所以选B。