A我妈妈去年来过北京，但是我的父亲没有来。他那时忙着工作。

My mother came to Beijing last year, but not my father. He was busy working.

youdao

A我妈妈去年来过北京，但是我的父亲没有来。他那时忙着工作。

My mother came to Beijing last year, but not my father. He was busy working.

youdao