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English we must work hard at it. A. So as to master B. Mastering C. Mastered D.

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English we must work hard at it. A. So as to master B. Mastering C. Mastered D.

________ English we must work hard at it.

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

 

试题答案

D

 

标签：hardatitworkenglish

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