John bought the car at $ 7 000 which is a low price and I doubt whether there has been a

问题补充：

John bought the car at $ 7,000 which is a low price and I doubt whether there has been a price since then.

A. low

B. lower

C. more low

D. lowest

答案：

A. low

(答案→)B. lower

C. more low

D. lowest

解析：考查比较级。John以7 000美元的低价买了那辆车，我怀疑是否从那以后会有(比这)更低的价格。

答案B