Of the two T-shirts I’d choose the one to save some money for a book.A. cheapestB. cheaper

问题补充：

Of the two T-shirts，I’d choose the one to save some money for a book.

A. cheapest

B. cheaper

C. more expensive

D. most expensive

答案：

A. cheapest

(答案→)B. cheaper

C. more expensive

D. most expensive

解析：cheapest最便宜的；cheaper比较便宜的；more expensive更贵的；most expensive最贵的。句意：在这两个T恤中，我要选择这个便宜的，以省下钱来买一本书。英语中在两个当中进行比较用比较级，结合语境可知选B。