单项选择题

Academic records cannot be duplicated.

A．borrowed
B．purchased
C．copied
D．rewritten
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单项选择题
John was irritated by the necessity for polite conversation.
A．troubled
B．annoyed
C．threatened
D．aroused
单项选择题
Ten years after the event, her death still remains a puzzle.
A．mist
B．fog
C．secret
D．mystery
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