—How much are the two pairs of shoes? —They are not expensive. I think fifty dollars eno

问题补充：

—How much are the two pairs of shoes?

—They are not expensive. I think fifty dollars enough.

A. is

B. are

C. were

D. was

答案：

(答案→)A. is

B. are

C. were

D. was

解析：金钱、时间和距离作为主语时，谓语动词用单数形式，故选A