单项选择题

As one of the youngest professors in the university, Longfellow is certainly on the ______ of a brilliant career.

A．porch
B．edge
C．threshold
D．fringe
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单项选择题
The scholar's interest in the ______ and analytical aspect of music didn't prevent her from enjoying concerts.
A．intelligent
B．brilliant
C．knowing
D．intellectual
单项选择题
If the task ______ by the end of this year is delayed, the company will be under punishment.
A．being completed
B．is completed
C．to be completed
D．completed
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