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 Olympic Games ______ in 776 BC in Olympia, a small town in Greece.
A．originated
B．stemmed
C．derived
D．descended
单项选择题
This kind of material can ______ heat and moisture.
A．delete
B．compel
C．constrain
D．repel
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