单项选择题

He's______ as a" bellyacher" -- he' s always complaining about something.

A．who is known
B．whom is known
C．what is known
D．which is known
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单项选择题
The letter seemed ______ by a child.
A．to have written
B．to write
C．to be writing
D．to have been written
单项选择题
The prisoner has been ______of many privileges that average citizens enjoy.
A．ensured
B．informed
C．deprived
D．convinced
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