-- you interrupt now? Can’t you see I’m on the phone?Sorry sir but it’s urgent.A. CanB

问题补充：

-- you interrupt now? Can’t you see I’m on the phone?

--Sorry sir, but it’s urgent.

A. Can

B. Should

C. Must

D. Would

答案：

A. Can

B. Should

(答案→)C. Must

D. Would

解析：此题考查情态动词，无难度。“你非要现在打断我吗？你难道没看见我在打电话吗？”must表说话者极不耐烦和生气的语气。