I met a man ( ) my grandfather worked with 30 years ago.A.who B.whom

题目

I met a man ( ) my grandfather worked with 30 years ago.A.who B.whom

答案

AB都对.
man 在定语从句中作宾语（my grandfather worked with 【the man】 30 years ago）
先行词在定语从句中作为宾语,那么关系代词可用who,whom,或不填.
如果with提前,则只能用whom.