单项选择题

—I'm sorry 1 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
Sometimes we can see ______ stars in tile sky at night.
A．thousand of
B．thousands of
C．thousands
单项选择题
There ______ two cups of tea on the table.
A．is
B．are
C．be
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