单项选择题

A. At a book store] C. In a library.
B. In a classroom. D. In a reading room.
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单项选择题
A. it was a waste of time. C. No, I didn’t. B. Yes, I did. D. It lasts two hours.
A. it was a waste of time.
C. No, I didn’t.

B. Yes, I did.
D. It lasts two hours.
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