单项选择题

There are no solitary, free-living creatures; every form of life is ______ other forms.

A．dependent to
B．depended to
C．depended on
D．dependent on
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单项选择题
The Sydney express was ______ for two hours by the sudden storm.
A．held down
B．held with
C．held out
D．held up
单项选择题
At no time should we be ______ by success.
A．carried off
B．carried away
C．carried down
D．carried out
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