His first book next month is based on a true story.
A. published
B. to publish
C. to be published
D. being published
网友回答
A. published
B. to publish
(答案→)C. to be published
D. being published
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。