问题补充：
. –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
答案：
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。
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