【题目】His first book ______ last month is based on a true story.
A．published B．to be published
C．to publish D．being published
在线课程【答案】A
【解析】
试题分析：考查动词语态。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。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，故选A项。