－Why are you looking so worried? Is there anything I can do for you?
－The puter break down when I nearly finished my position.
A. can
B. should
C. must
D. dare
网友回答
A. can
B. should
(答案→)C. must
D. dare
解析：考察情态动词辨析。Can可能；should应该；must必须，一定，非得，偏偏；dare敢；句意：—为什么你看上去如此担忧？我可以为你做什么？—当我写完作文的时候，计算机偏偏在那个时候坏了。根据句意说明must表示的是偏偏。故C正确。