It never occurred to me you could succeed in persuading him to change his mind.
A. which
B. what
C. who
D. that
网友回答
A. which
B. what
C. who
(答案→)D. that
解析：考查主语从句。It是形式主语 you could succeed in persuading him to change his mind是主语从句，且从句句意完整，不缺如何成分，所以用that 引导。选D。