单项选择题

A．It is difficult to identify.
B．It has been misplaced.
C．It is missing.
D．It has been borrowed by someone.
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单项选择题
A．Toys for children.B．Important documents.C．Food and coffee.D．Clothes and scientific papers.
A．Toys for children.
B．Important documents.
C．Food and coffee.
D．Clothes and scientific papers.
填空题
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