单项选择题

The old man and his dog were ______ to each other.

A．supported
B．helped
C．relied
D．devoted
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单项选择题
The train was late ______ the heavy snowstorm.
A．as a result of
B．in case of
C．with the relation to
D．by way of
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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