—Hi，Mary.Would you like to go to the concert this evening?
—Sorry，Tom. tomorrow's lessons，I have no time to go out with you.
A. Not preparing
B. Not having prepared
C. Not to prepare
D. Being not prepared
网友回答
A. Not preparing
(答案→)B. Not having prepared
C. Not to prepare
D. Being not prepared
解析：根据句意可知，选项动词为原因状语，表主动，强调动作的完成性，相当于一个原因状语从句：As I haven't prepared tomorrow's lessons...故应选B(Not having prepared)。