单项选择题

Wild ducks always fly in a definite ______ .

A．figure
B．formula
C．shape
D．formation
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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
单项选择题
I'd prefer him ______ the key under the mat.
A．to leave
B．leave
C．leaving
D．left
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