Everyone knows, perhaps except you, your girl-friend is a cheat.A. whoB. whichC. thatD. w

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A. who
B. which
(答案→)C. that
D. what
解析：考查宾语从句连接词。Know后是一个宾语从句，, perhaps except you, 是插入语，肯定句用that引导宾语从句，从句不缺少成分，that引导宾语从句无意义。故选C。