单项选择题

Sometimes we can see ____________ stars in the sky at night.

A．thousand of
B．thousands of
C．thousands
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单项选择题
We really enjoyed ____________ on the farm.
A．work
B．to work
C．working
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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