单项选择题

It is bad manners to ______ other people behind their backs.

A．do up
B．do by
C．do away with
D．do down
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单项选择题
I'd prefer him ______ the key under the mat.
A．to leave
B．leave
C．leaving
D．left
单项选择题
Although cats cannot see in complete darkness, their eyes are much more ______ to light than are human eyes.
A．glowing
B．brilliant
C．sensitive
D．gloomy
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