it's best to keep healthy t____ exercise.请问空内应填什么?

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it's best to keep healthy t____ exercise.请问空内应填什么?
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it's best to keep healthy t____ exercise.请问空内应填什么?
it's best to keep healthy t____ exercise.
请问空内应填什么?

it's best to keep healthy t____ exercise.请问空内应填什么?
through 通过锻炼