单项选择题

It ______ until dusk that he realized that it was too late to return home.

A．was
B．wasn't
C．weren't
D．were
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单项选择题
John said that his present job does not provide him with enough ______ for his organizing ability.
A．scope
B．space
C．capacity
D．range
单项选择题
Though steam engines have now passed the ______ of their usefulness, their heritage remains.
A．prime
B．era
C．epoch
D．date
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