单项选择题

Petrol is refined from the __________ oil we take out of the ground.

A．crude
B．fresh
C．rude
D．original
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单项选择题
__________ in the United States, St. Louis has now become the 24th largest city.
A．Being the fourth biggest city
B．It was once the fourth biggest city
C．Once the fourth biggest city
D．The fourth biggest city it was
单项选择题
He was punished __________ he should make the same mistake again.
A．unless
B．provided
C．if
D．lest
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