单项选择题

After ______ seemed an endless wait, the arrogant superstar appeared onto the press conference.

A．it
B．that
C．what
D．which
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单项选择题
It is obviously necessary that both the President and his advisers ______ down to earth.
A．will be
B．should be
C．would be
D．must be
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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