It hit me my mother could be the proper person to persuade Dad to change his mind．
A. which
B. what
C. that
D. if
网友回答
A. which
B. what
(答案→)C. that
D. if
解析：考查名词性从句。本题考查it作形式主语，真正的主语为that my mother could be the proper person to persuade Dad to change his mind。