题目内容：
21. -What did you do last night,Bob?-First I did my homework,and then I played ______ piano for half ______ hour.(本题3.0分)
A、 the；a
B、 /；an
C、 the；an
D、 a；the
参考答案：
选择题：21. -What did you do last night,Bob?-First I did m
- 题目分类：河套学院-大学英语4
- 题目类型：选择题
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-First I did my homework,and then I played ______ piano for half ______ hour.(本题3.0分)
A、 the；a
B、 /；an
C、 the；an
D、 a；the