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

问题补充：

Everyone knows, perhaps except you, your girl-friend is a cheat.

A. who

B. which

C. that

D. what

答案：

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。