单项选择题

It is always satisfying to do something that no one else ______.

A．did
B．does
C．had done
D．has done
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单项选择题
The mayor ______ the citizens that the prevailing of the disease would be under control soon.
A．assured
B．ensured
C．insured
D．secured
单项选择题
I'd like to take advantage of this opportunity to express my sincere ______ for your help.
A．appreciation
B．guarantee
C．regulation
D．recreation
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