单项选择题

The students were told to make ______ study of the air situation in ______ city of Beijing.

A．不填; the
B．a; the
C．the; the
D．a; 不填
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To learn is one thing, to teach is ______.
A．the other
B．other
C．others
D．another
单项选择题
I'll be working ______ tomorrow.
A．all day
B．the all day
C．on the all day
D．on all the day
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