单项选择题

Please ______ receipt of this document by signing and returning the enclosed form.

A．dignify
B．clarify
C．acknowledge
D．illustrate
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单项选择题
Older people can quickly become dispirited and depressed by ______ illness.
A．chronic
B．permanent
C．perpetual
D．sustained
单项选择题
Both certificates are ______ for three months and the ceremony must take place in the district where notice has been given.
A．valuable
B．effective
C．valid
D．functional
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