单项选择题

Can I have ______

A． three piece of paper
B． three pieces of papers
C． three pieces of paper
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单项选择题
I can do this for you. I still have ______ time.
A． little
B． a little
C． a few
单项选择题
The doctor asked the child's parents ______.
A． what is the problem
B． what was the problem
C． what the problem was
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