— are these trousers? —They are only $15.A. How many B. How much C. How

问题补充：

— are these trousers?

—They are only $15.

A. How many B. How much C. How

答案：

解析：

试题分析: 句意：裤子多少钱？只15美元。How many多少， How much多少钱，How如何；根据They are only $15只15美元，可知选B