We have T-shirts blue red yellow and blackonly 25 yuan.A. in; inB. on; byC. in; forD. o

问题补充：

We have T-shirts blue, red, yellow and blackonly 25 yuan.

A. in; in

B. on; by

C. in; for

D. on; on

答案：

A. in; in

B. on; by

(答案→)C. in; for

D. on; on

解析：英语中当表示在颜色、尺寸、形状等方面时，应该用介词in；而表示价格是多少时，价格前面应该用介词on。所以本题选C。