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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______ everything taking into consideration, the solution offered by the dean is relatively feasible.
A．Since
B．For
C．As
D．With
单项选择题
With so much work to do, John ______ to play games last night.
A．mustn't go
B．wouldn't go
C．oughtn't to go
D．shouldn't have got
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