单项选择题

Mary ______ that piece of cake for twenty Yuan.

A．spent
B．cost
C．bought
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单项选择题
I didn't know ______ at the meeting yesterday.
A．what to say
B．to say what
C．why to say
单项选择题
There ______ some boys on the playground.
A．is
B．are
C．have
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