单项选择题

You have to be patient if you want to sustain your position.

A．maintain
B．better
C．acquire
D．support
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单项选择题
He endured great pain before he finally expired.
A．fired
B．resigned
C．died
D．retreated
单项选择题
The dentist has decided to extract her bad tooth.
A．take out
B．break off
C．push in
D．dig up
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