问题补充:
-Why are you looking so worried? Is there anything I can do for you?
-The computer break down when I nearly finished my composition.
A. can
B. should
C. must
D. dare
答案:
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。