单项选择题

They agreed to modify their policy.

A．clarify
B．change
C．define
D．develop
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单项选择题
The room is dim and quiet.
A．tiny
B．pleasant
C．dark
D．agreeable
单项选择题
It's prudent to start any exercise program gradually at first.
A．workable
B．sensible
C．possible
D．feasible
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