he has made up his mind no one can make him change it.A. Once B. UnlessC. Until D. As

问题补充：

he has made up his mind, no one can make him change it.

A. Once

B. Unless

C. Until

D. As

答案：

(答案→)A. Once

B. Unless

C. Until

D. As

解析：考查连词辨析。A一旦；B除非，如果…不…；D直到…才；D因为；句意：一旦他下定决心，没有人能让他改变。故A正确。