单项选择题

She had to undergo psychiatric treatment as she was mentally ______.

A．unsafe
B．unstable
C．unsteady
D．unfixed
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单项选择题
The driving instructor told me to pull ______ at the post office.
A．round
B．back
C．up
D．down
单项选择题
Barbara ______ in doing it again though she had failed more than a dozen times.
A．consisted
B．insisted
C．persisted
D．assisted
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