单项选择题

The professor can hardly find sufficient grounds ______ his argument in favor of the new theory.

A．which to base on
B．on which to base
C．to base on which
D．which to be based on
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A compound consists of atoms ______ different chemical properties.
A．of
B．by
C．for
D．with
单项选择题
He has no ______ of winning the game.
A．occasion
B．chance
C．luck
D．fate
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