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Robert is good at language, we all know. A. because B. for C. as D. since

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Robert is good at language, we all know. A. because B. for C. as D. since

Robert is good at language, ________ we allknow.

A. because    B.for   C.as    D.since

 

试题答案

答案:C

解析:

as we all know 众所周知