—Hi Mary.Would you like to go to the concert this evening?—Sorry Tom. tomorrow's lessons I

问题补充：

—Hi，Mary.Would you like to go to the concert this evening?

—Sorry，Tom. tomorrows 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：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 prepared tomorrows lessons...故应选B(Not having prepared)。

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