English we must work hard at it. A. So as to master B. Mastering C. Mastered D. To master 【查看更多】

 

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13.         English we must work hard at it.

      A. So as to master   B. Mastering   C. Mastered   D. To master

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________ English we must work hard at it.

A. So as to master  B. Mastering  C. Mastered  D. To master

 

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13.         English we must work hard at it.

A.So as to master

B.Mastering

C.Mastered

D.To master

 

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    English we must work hard at it.

   A. So as to master  B. Mastering  C. Mastered  D. To master

 

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