He introduced me to his wife, ______ I hadn’t met before.

He introduced me to his wife, ______ I hadn’t met before.
A、who
B、whom
C、that
D、whose
【正确答案】：B
【题目解析】：在限定性定语从句中，关系代词作宾语时可以省略:但在 非限定性定语从句中，关系代词作宾语时不能省略。whom不能省去。上册P339