单项选择题

Bill is an example of a severely disabled person who has become ______ at many survival skills.

A．proficient
B．persistent
C．consistent
D．sufficient
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单项选择题
Because of a ______ in her hearing, the teacher gave her a seat in the front row.
A．error
B．mistake
C．blunder
D．defect
单项选择题
Everyone has a legal ______ to provide the tax office with details of their earnings.
A．oath
B．obligation
C．optimum
D．orientation
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