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

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

________ they are doing has never been donebefore.

A. That B.Which  C.Whether   D.What

 

试题答案

答案：D

解析：

主语从句

 

标签：hasneverbeentheyare

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