单项选择题

—I'm sorry I can't do it.
—______.

A．Not at all
B．You are welcome
C．It doesn't matter
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单项选择题
Which game ______ you ______ today
A．are ; on
B．do ; in
C．are ; in
单项选择题
The children are standing ______ the starting line and are ready ______run.
A．at; to
B．at; for
C．in; to
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