单项选择题

This mathematic problem was so difficult that no student and no teacher_________ able to solve it.

A．were
B．is
C．was
D．are
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单项选择题
My uncle went to the police station to_________ the lost watch.
A．inquire
B．claim
C．demand
D．require
单项选择题
A．adversaryB．adversarialC．adversityD．advertency
A．adversary
B．adversarial
C．adversity
D．advertency
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