单项选择题

"Maria has blisters in her boots."
"She ______ walking such a long distance."

A．was used not to
B．used to
C．is not used to
D．did not used to
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单项选择题
The ______ crown jewels are kept in the Tower of London.
A．valued
B．valueless
C．invaluable
D．usable
单项选择题
Once you become a soldier, you will be given a monthly ______ by the army.
A．income
B．allowance
C．wage
D．salary
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