he has made a decision it is not easy for you to make him change his mind.A. Though B. U

问题补充：

he has made a decision, it is not easy for you to make him change his mind.

A. Though

B. Unless

C. Once

D. Until

答案：

A. Though

B. Unless

(答案→)C. Once

D. Until

解析：考查连词辨析。一旦他作出决定你不容易让他改变主意。A. Though 虽然 B. Unless除非 C. Once一旦 D. Until 直到根据语境选C