单项选择题

When I got to the airport, the plane ______.

A． already took off
B． had already taken off
C． has already taken off
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单项选择题
Which is Lucy's bag, the yellow one ______ the red one
A． and
B． but
C． or
单项选择题
The ______ month of the year is December.
A． third
B． twelve
C． twelfth
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