单项选择题

Mr. Young and Miss Liu ______ from America.

A．both are
B．are both
C．are all
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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
单项选择题
Sometimes we can see ______ stars in tile sky at night.
A．thousand of
B．thousands of
C．thousands
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