-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 preparingB.Not having preparedC.Not to prepareD.Being not prepared
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B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项(Not having prepared)；选项A为现在分词，不表示完成的意思；选项C为不定式的否定结构表目的；选项D为被动结构，not应置于分词being前面，均不符句意。