题目内容：
25. -What did you do last night,Bob?-First I did my homework,and then I played ______ piano for half ______ hour.(本题4.0分)
A、 the；a
B、 /；an
C、 the；an
D、 a；the
参考答案：
选择题：25. -What did you do last night,Bob?-First I did m
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-First I did my homework,and then I played ______ piano for half ______ hour.(本题4.0分)
A、 the；a
B、 /；an
C、 the；an
D、 a；the