单选They are the children ___thire parents are hard.

问题描述:

单选They are the children ___thire parents are hard.
A.on who
B.on whom
C.who
D.whom
原因和其他的错因
貌似who也可以做代词宾语的...

B状语从句中先行词whom在从句中作宾语且缺少介词on
whom和who都可作宾语没错,但是介词后必须用whom