there were dirty marks on her trousers which she had wiped her hands.

问题描述:

there were dirty marks on her trousers which she had wiped her hands.
1这句话先行词是?2将这句话分为两句

我觉得which前应该有on,或者把which改为where.
先行词是裤子.
There were dirty marks on her trousers.She wiped her hands on her trousers.