wonderful concert they are putting on in the city square!A. HowB. WhatC. What aD. What an

问题补充：

wonderful concert they are putting on in the city square!

A. How

B. What

C. What a

D. What an

答案：

A. How

B. What

(答案→)C. What a

D. What an

解析：本题难度适中，wonderful是一个形容词，用what ，用a 不是an，答案选C。