单项选择题

The key ______ success is hard work and persistence.

A．on
B．to
C．of
D．into
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单项选择题
My sole object was to get shelter ______ the snow, to get myself covered and warm.
A．for
B．off
C．from
D．over
单项选择题
We must get there ______ before he has a chance to break the news to her.
A．by no means
B．by all means
C．at no means
D．in all means
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