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
No one could come up with an easy solution to the government's predicament—labor ______ which is caused by the wars.
A．decline
B．vacancy
C．rarity
D．shortage
单项选择题
Big businesses enjoy certain ______ that smaller ones do not have.
A．transactions
B．privileges
C．subsidies
D．substitutes
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