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you have begun, you must keep it up. A. As soon as B. While C. Once D. Although

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you have begun, you must keep it up. A. As soon as B. While C. Once D. Although

________you have begun, you must keep it up.

A.As soon as B.While    C.Once    D.Although

 

试题答案

答案:C

提示:
once一旦。