we are doing has never been done before. A.That B.Which C.Whether D.What——青夏教育精英家教网—

摘要： we are doing has never been done before. A.That B.Which C.Whether D.What

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______ we are doing has never been done before.

A. That B. What

C. Which D. Whether

_______ we are doing has never been done before.

A. That B. What

C. Which D. Whether

_______ we are doing has never been done before.

A. That　　　　　　　　　　 B. What

C. Which　　　　　　　　　　 D. Whether

____we are doing has never been done before.
A. That 　　 B. Which　　　 C. whether　　　　　 D. What

_______ we are doing now has never been done before.?

A. That B. What?

C. Which D. Whether?

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