单项选择题

The new washing machines are _______ at the rate of fifty a day.

A．turned up
B．turned down
C．turned out
D．turned in
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单项选择题
She worked hard at her task before she felt sure that the result would _______ her long effort.
A．justify
B．testify
C．rectify
D．verify
单项选择题
Malnutrition may well be _______his ill health.
A．the reason of
B．due to
C．the cause of
D．owing to
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