单项选择题

It is well-known that the retired workers in our country are ____________free medical care.

A． entitled to
B． involved in
C． associated with
D． assigned to
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单项选择题
Your advice would be ____________valuable to him, who is at present at his wit's end.
A． exceedingly
B． excessively
C． extensively
D． exclusively
单项选择题
There ought to be less anxiety over the perceived risk of getting cancer than ________________ in the public mind today.
A．exists
B．exist
C．existing
D． existed
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