you make a promise you should keep .A. Once… it B. If… it C. When … oneD. Although … on

问题补充：

you make a promise, you should keep .

A. Once… it

B. If… it

C. When … one

D. Although … one

答案：

(答案→)A. Once… it

B. If… it

C. When … one

D. Although … one

解析：第一空考查连词，once一旦，if如果，when当…时候，although虽然，第二空填it代指前面的a promise，句意是：一旦你许下诺言，你应该遵守它。选A。