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you have made a promise, you should carry it out. [ ] A. Until B. Once C. For D.

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you have made a promise, you should carry it out. [ ] A. Until B. Once C. For D.

_________ you have made a promise, you should carry it out.

[]A.

Until

B.

Once

C.

For

D.

While

试题答案

答案:B

解析:

once引导状语从句。