Question

【题目】His study in Peking University lasted four years, ______ he founded his own company in Hong Kong.

A. after which B. after when

C. after that D. after it

Answer 1

【答案】A

【解析】试题分析：分析句子结构可知该处为非限制性定语从句，用关系代词which指代前面的“在北大学习四年”这件事，故选A。