单项选择题

When confronted with such questions, my mind goes ______, and I can hardly remember my own date of birth.

A．dim
B．vain
C．faint
D．blank
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单项选择题
Linda did not have time to go to the concert last night because she was busy ______ for her experiment.
A．to prepare
B．to be prepared
C．being prepared
D．preparing
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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