一道定语从句填关系词的题

问题描述:

一道定语从句填关系词的题
I don't know the thing ____ Tom and Mary quarreled yesterday.

the thing不是物吗,quarrel with后接人接物也用with吗打错了应该是quarrel with sb (about/over sth)所以应该用 about which它其实就是Tom and Mary quarrelled about the thing yesterday.