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
The seating ______ of the lecture hall is 2000.
A．capability
B．capacity
C．quantity
D．ability
单项选择题
When he became rich, he ______ his former friends.
A．broke with
B．broke down
C．broke away from
D．broke off
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