单项选择题

It is one thing to locate oil, but it is quite another to ______ and transport it to the industrial centers.

A．permeate
B．extract
C．distinguish
D．concentrate
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______ she realized it was too late to go home.
A．No sooner it grew dark than
B．Hardly did it grow dark that
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______ you are leaving tomorrow, we can eat dinner together tonight.
A．For
B．Since
C．Before
D．While
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