单项选择题

The writer was so absorbed ______ his job that he did not notice me enter the room.

A．on
B．of
C．in
D．at
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单项选择题
In my opinion, all people should be ______ for the things they do.
A．popular
B．responsible
C．respectful
D．anxious
单项选择题
Each educational system is not perfect in a strict sense, which has its______.
A．limitations
B．line
C．front
D．advantage
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