单项选择题

I hope my students will allow a ______ for error correction.

A．quota
B．margin
C．burial
D．fringe
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单项选择题
His voice ______ his Welsh origins though he has been living in New York for 25 years.
A．preserves
B．muffles
C．monitors
D．betrays
单项选择题
Profit sharing is a good ______ for employees.
A．treatment
B．experiment
C．incentive
D．reinforce
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