—Whatdidyoudolastnight,Bob?—FirstIdidmyhomework,andthen...

问题详情：

— What did you do last night, Bob?

— First I did my homework, and then I played ______ piano for half ______ hour.

A．the；a     B．/；an     ；an      D．a；the

【回答】

C

知识点：冠词

题型：选择题