单项选择题

The doctor assured Susan that the pain would ______one hour after she took the medicine.

A．wear out
B．wear down
C．wear away
D．wear on
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单项选择题
The failure of the experiment to produce the expected result should alone be ______to your carelessness.
A．contributed
B．ascribed
C．distributed
D．prescribed
单项选择题
The physician had to visit his patient six ______days before the patient could be considered in a fair condition.
A．consequent
B．consecutive
C．consistent
D．conservative
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