—Jack, you behave yourself? You're no longer a kid．
—Sorry, Daddy．It won't happen again．
A. mustn't
B. can't
C. should
D. would
网友回答
A. mustn't
(答案→)B. can't
C. should
D. would
解析：考查情态动词，mustn't表示禁止；can't表示不能；should表示应该；would表示将要。句子意思“难道你表现不好吗？”固定词组behave yourself意思“表现好一点”