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
Mrs. Zhang is a friend of________.
A． John's mother
B． mother of John
C． John's mother's
单项选择题
We really enjoyed ____________ on the farm.
A． work
B． to work
C． working
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