单项选择题

The old man walked slowly, stopping frequently ______.

A．on rest
B．at rest
C．resting
D．to rest
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单项选择题
If I do something in vain, I do it ______.
A．without interest
B．without success
C．with difficulty
D．with ease
单项选择题
Being ignorant of the law is no ______of breaking the law.
A．reason
B．excuse
C．ground
D．point
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