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
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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
单项选择题
Not until quite recently _______any idea of what a guided rocket is like.
A． did I have
B． do I have
C． should I have
D． would I have
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