Our new product is based on a(n) _______ concept.

Our new product is based on a(n) _______ concept.
A、ordinary
B、oldest
C、excellent
D、traditional
【正确答案】：D
【题目解析】：A:普通的  B:老的C:好的  D:传统的
句意：  我们的新产品是基于传统的的概念。