单项选择题

There ______ some boys on the playground.

A．is
B．are
C．have
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单项选择题
-- Thank you very much. -- ______.
A．Thanks a lot
B．Oh, yes, thank you
C．That's all right
单项选择题
Mary ______ that piece of cake for twenty yuan.
A．spent
B．cost
C．bought
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