It is a waste of time__such a person to join us,because he will never change his mind.
问题描述：
It is a waste of time__such a person to join us,because he will never change his mind.
A your persuading B you persuaded C of you to persuade D for you persuading
谢谢解释为什么是a不是c
答
C of you to persuade 表达a waste of time是对you的评价.