I will never forget the classmates I studied with.A. thatB. whichC. whoseD. whom

问题补充：

I will never forget the classmates I studied with.

A. that

B. which

C. whose

D. whom

答案：

A. that

B. which

C. whose

(答案→)D. whom

解析：考查定语从句。本题的定语从句的先行词是the classmates, whom指代先行词作为介词with的宾语。Which指代的先行词不能是人；whose在定语从句中做定语；that实际上是可以的，但是whom是最佳答案。句意：我永远不会忘记和我一起学习的同学们。故D正确。