单项选择题

While I was waiting for her, I killed time（）looking in the show windows.

A. by
B. with
C. in
D. over

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单项选择题
22（）

A．solve
B．find
C．develop
D．respond
单项选择题
African people used （）as money in ancient times.

A．cloth and knives
B．cows and other animals
C．copper coins
D．tusks, monkey tails and salt
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