—you play the piano at this time of the day ? I need a good rest for tomorrow’s test. — So

问题补充：

—you play the piano at this time of the day ? I need a good rest for tomorrow’s test.

— Sorry.

A. Must

B. Shall

C. Can

D. May

答案：

(答案→)A. Must

B. Shall

C. Can

D. May

解析：考查情态动词。Must 在这里意为，非要，偏偏，句意：你非要在一天中的这个时候弹钢琴？为了明天的考试我需要好好休息。对不起。所以选A。