单项选择题

The mechanic used to ______ and oil the machine all the time.

A．polish
B．take
C．design
D．lay
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单项选择题
Drunkenness was as much of an ______ to enlightenment(启蒙) as lack of education.
A．obstacle
B．attack
C．insult
D．indifference
单项选择题
We have studied long and hard to ______ those objections.
A．overpay
B．overcome
C．win
D．omit
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