we all feel sorry that Mr Smith,a visiting professor _____we"ve learnde a lot over these years,is le

题目

we all feel sorry that Mr Smith,a visiting professor _____we"ve learnde a lot over these years,is leaving next week
A.about whom B.with whom Cof whom D.from whom

答案

应该选D,将从句还原,we've learned from(注意短语,learn from) a visiting professor
在这里,a visiting professor做从句的宾语,但我们知道,不能直接用learn sb 应该加介词from