He was a(n) singer until the age of 40, when he turned professional.
A. gifted
B. amateur
C. sacred
D. entire
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A. gifted
(答案→)B. amateur
C. sacred
D. entire
解析：考查形容词：A. gifted有天赋的，B. amateur 业余的，C. sacred宗教的，神圣的，受崇敬的D. entire完全的，句意：他都是个业余歌手，直到40岁他成了专业的。选B。