单项选择题

Certainly man must ______ the future, and find ways of providing for his use.

A．look to
B．look up
C．look for
D．look on
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单项选择题
They seized Belgrade, though only after having encountered a stubborn ______.
A．persistence
B．resistance
C．insistence
D．assistance
单项选择题
He didn't do so well in the race ______ his training.
A．for all
B．alcove all
C．in all
D．after all
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