I shall explain the rules to _____ we have received many objections

问题描述:

I shall explain the rules to _____ we have received many objections
A.which
B.where
C.who
D.whom
选哪个?为什么?

A
1 修饰语不是人,所以不选C D
2 to在此是介词,介词提前不用where