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
After years of research, scientists have ______the virus that is responsible for the disease.
A．recognized
B．identified
C．guaranteed
D．notified
单项选择题
The criminal was sentenced to prison for five years and was______ of political rights for two years.
A．excluded
B．deprived
C．disabled
D．gripped
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