单项选择题

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
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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
单项选择题
______ everything taking into consideration, the solution offered by the dean is relatively feasible.
A．Since
B．For
C．As
D．With
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