题目内容：

3.Which of the two cows___you keep produces more milk?A.that B.which C.whom D.when C和D肯定错

优质解答

选A吧,you keep produces more milk是用来修饰cows的从句,这里要选一个连接词把 Which of the two cows和you keep produces more milk连起来,这里的意思都已经表达出来,所以选that 这个不代表任何意思的词