单项选择题

A. Someone spilled water on it. B. Someone lost it.
C. It was made of low quality metal. D. The standard for measuring had changed.
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D
单项选择题
A. The man’s professor. B. The man’s roommate. C. A neighbor. D. The man’s brother.
A. The man’s professor. B. The man’s roommate.
C. A neighbor. D. The man’s brother.
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