John look at the time.you stop playing the piano at such a late hour?A. MustB. Can’tC. May

问题补充：

John,look at the time.you stop playing the piano at such a late hour?

A. Must

B. Can’t

C. May

D. Need

答案：

A. Must

(答案→)B. Can’t

C. May

D. Need

解析：说话人有埋怨并命令对方停止之意：约翰，看看时间，你不能在这么晚的时间停止

弹钢琴吗？