you make a promise you should keep it. A. The momentB. While C. OnceD. As if

问题补充：

you make a promise, you should keep it.

A. The moment

B. While

C. Once

D. As if

答案：

A. The moment

B. While

(答案→)C. Once

D. As if

解析：原句意思是，一旦你做出了承诺，你就要遵守。The moment此刻While然而Once一旦As if好像，所以选C。