单项选择题

In this private school, a dentist ______ the pupils' teeth twice a week.

A．injures
B．instructs
C．inspects
D．informs
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单项选择题
He never laughed, ______ lose his temper.
A．or he ever did
B．nor did he ever
C．or did he ever
D．nor he ever did
单项选择题
Mary never tells anyone else what she does for a ______ .
A．job
B．work
C．living
D．life
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