(2012·重庆高考)— 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
网友回答
A. Can
B. Should
(答案→)C. Must
D. Would
解析：选C 考查情态动词的用法。句意：“你偏要现在打扰我吗？难道你没有看到我正在打电话吗？”“对不起，先生，但是情况太紧急了。”must表示“偏要，硬要”。故选C项。