问题补充：
His first book next month is based on a true story.
A. published
B. to be published
C. to publish
D. being published
答案：
A. published
(答案→)B. to be published
C. to publish
D. being published
解析：
考查非谓语动词。此处是非谓语动词作后置定语，由时间状语next month可知所填非谓语动词表示将来的动作，故用动词不定式；其逻辑主语是所修饰的名词book，不定式与逻辑主语是被动关系，故用不定式的被动式，故选B项。
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