单项选择题

A．in
B．on
C．for
D．within
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单项选择题
A．situationB．circumstancesC．backgroundD．condition
A．situation
B．circumstances
C．background
D．condition
单项选择题
As the conversation begins, what are the man and woman doing
A．Looking at some photographs.
B．Selling cameras.
C．Teaching a photography class.
D．Repairing camera equipment.
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