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IoftenhaveconversationswithJohnoverthetelephone,keepintouchwithTombyletter.A.whereB.whichC.whoD.while这一题选什么?为什么?

题目详情
I often have conversations with John over the telephone,_____ keep in touch with Tom by letter.
A.where
B.which
C.who
D.while
这一题选什么?为什么?
▼优质解答
答案和解析
C
这是定语从句,John是人,修饰人用who