【题目】The president of Harvard pioneered the elective system______ students were able to choose their own courses of study.
A.on whichB.about whichC.to whichD.by which
在线课程【答案】D
【解析】
考查定语从句。句意：哈佛大学的校长率先推出了选修课，学生可以选择自己的课程。此处为“介词+关系代词”结构定语从句修饰先行词system，且根据此处表示“学生可以借助系统选择自己的课程”，表示“借助”应用介词by，做介词的宾语且指“系统”应用关系代词which。故选D。