单项选择题

In Nigeria, rules have been handed down orally from generation to generation and now form the country's ______ law.

A．traditional
B．conventional
C．customary
D．conservative
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单项选择题
She ______ a strong and positive influence over her friends.
A．draws
B．exerts
C．ensures
D．expends
单项选择题
Since you didn't go over the lessons before the exam, you can find no ______ for your failure.
A．explanation
B．excuse
C．exception
D．expection
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