单项选择题

I haven't met him _______the last committee meeting.

A． for
B． since
C． at
D． before
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单项选择题
The criminal didn't realize the value of freedom _______he had lost it.
A． if
B． as
C． while
D． until
单项选择题
Are you going to fix the car yourself, or are you going to have it_______
A． fixing
B． to fix
C． fix
D． fixed
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