单项选择题

A compound consists of atoms ______ different chemical properties.

A．of
B．by
C．for
D．with
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单项选择题
He has no ______ of winning the game.
A．occasion
B．chance
C．luck
D．fate
单项选择题
Never before in China ______ for the farmers.
A．has so much been done
B．have so much been done
C．has been done so much
D．so much has been done
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