单项选择题

The new aircraft ______ its tests very well.

A．experienced
B．hurried
C．supported
D．underwent
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单项选择题
The disease has completely ______ in this country.
A．died out
B．died down
C．died away
D．died off
单项选择题
Mrs. Wilson works more slowly than the other secretaries because she takes pride ______ everything that she does.
A．in
B．of
C．to
D．on
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