单项选择题

The incredible precision of the equipment is ______ to the mechanical skill of the engineers who built it.

A．testimony
B．symbol
C．evidence
D．attribute
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单项选择题
Bread and butter ______ popular with the westerners.
A．is
B．are
C．were
D．be
单项选择题
The politician will never again enjoy a reputation as a national hero as it ______ before the scandal was exposed.
A．could
B．did
C．would
D．was
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