单项选择题

Gasoline is processed from ______ oil.

A．crude
B．raw
C．rough
D．tough
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单项选择题
The______question in this case is whether the accused had a motive for this crime ornot.(2004年西南财经大学考博试题)
A．crucial
B．forcible
C．supreme
D．valuable
单项选择题
The decision was made at the______ moment when the country’s fate was at stake.
A．optimum
B．opportune
C．crucial
D．reckless
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