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【题目】______ you have made a promise, you should carry it out.

A. Once B. Until C. For D. While

【答案】A

【解析】

试题分析:A. Once一旦;B. Until 直到;C. For因为;D. While 然而,当……时。句意:一旦许下诺言你就应该去执行。根据句意选A。

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