--- It’s 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
网友回答
A. can; must
B. will; might
(答案→)C. should; must
D. must; may
解析：考查情态动词：句意：--很晚了，我儿子应该回来了！--别担心，我敢说，他一定有很多作业要做。第一空填should表示“按道理应该”，can是“能够”，will是“愿意”，must是“必须”，第二空填must表示推测，“一定是”might和may是“可能”，选C。