His frist book __ next month is based on a ture story.选项A.published.选项B.to be published.

问题描述:

His frist book __ next month is based on a ture story.选项A.published.选项B.to be published.
这题为什么选B 这句话用A选项做定语修饰 book 为什么不行?

不定式短语作后置定语
根据next month可知动作还没有发生,故排除A