单项选择题

The key ______ good health is to eat and sleep regularly.

A．to
B．for
C．of
D．in
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单项选择题
It took him several months to ______ the wild horse.
A．tend
B．cultivate
C．breed
D．tame
单项选择题
Without our teacher's help, we ______ so much.
A．didn't achieve
B．will not achieve
C．don't achieve
D．would not have achieved
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