. –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：可联系答.案.网客服索取。