一道语法题 alec asked the policeman ( )he worked to

题目

一道语法题 alec asked the policeman ( )he worked to
一道语法题
alec asked the policeman ( )he worked to contact him whenever there was an accident.
a with him
b who
c with whom
d whom
为什么是c不是d

答案

因为work是个不及物动词,你可以说he worked with the policeman. 但不可以说：he worked the policeman.这里的whom=the policeman