. –Hi Mary. Would you like to go to the concert this evening? --Sorry Tom. Tomorrow’s le

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

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