He was educated at the local high school he went on to Beijing University. A. at whichB.

问题补充：

He was educated at the local high school, he went on to Beijing University.

A. at which

B. after which

C. in which

D. during which

答案：

A. at which

(答案→)B. after which

C. in which

D. during which

解析：句意，他就读于当地的一所高中，之后他就去北京大学读书了。分析句子结构，逗号之后是由介词+关系代词引导的非限制性定语从句，根据所表达的意思，在……之后，所以用介词after。