What did you do last night，Bob？
First I did my homework，and then I played ______ piano for half ______ hour．（ ）
A．the；aB．/；anC．the；anD．a；the
What did you do last night，Bob？
First I did my homework，and then I played ______ piano for half ______ hour．（ ）
A．the；aB．/；anC．the；anD．a；the
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