His first book ________ next month is based on a true storyA.publishedB.to publishC.to be publishedD.being published
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C解析考查分词做定语。His first book与publish构成被动关系，用过去分词表示被动和已经完成，相当于一个定语从句。Published next month=which was published;句意：上个月出版的他的第一本书是以一个真实的故事为基础的。