Question

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

Answer 1

B

试题分析：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。
点评：关系代词前介词的确定方法：依据定语从句中动词或形容词的某种习惯搭配来确定；依据与先行词搭配的具体意义而定；根据所表达的意思来确定。