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

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

【答案】A

【解析】

試題分析：A. Once一旦；B. Until 直到；C. For因為；D. While 然而，當……時。句意：一旦許下諾言你就應(yīng)該去執(zhí)行。根據(jù)句意選A。

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