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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Although ______ American literature, he failed to remember the writer of the masterpiece.
A．he was knowing
B．he is knowing
C．knows
D．having a knowledge of
单项选择题
The Housing Committee has decided to give ______ to the young married couple with only one child.
A．preferment
B．priority
C．superiority
D．prestige
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