单选题 For a limited time only, this exquisite collector's item will be offered at forty percent off of the original ______.
A. price B. piece
C. challenge D. certificate

【正确答案】 A

【答案解析】[解析] 根据句中的“will be offered at forty percent off”可知此空应填入和价格有关的单词。故本题正确答案为A。