By now when one makes a large purchase he should have opportunity to change his mind.A.

问题补充：

By now, when one makes a large purchase, he should have opportunity to change his mind.

A. accurate

B. urgent

C. special

D. adequate

答案：

A. accurate

B. urgent

C. special

(答案→)D. adequate

解析：考查形容词辨析。A准确的；B紧急的；C特别的；D充分的，足够的；句意：到现在为止，当一个人在买很多东西的时候，他本应该有足够的机会来改变想法。故D正确。