单项选择题

We should always bear in mind that ______ decisions often result in serious consequences.

A．urgent
B．instant
C．prompt
D．hasty
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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
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
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