the man was successful () his hard work填by还是through?

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themanwassuccessful()hishardwork填by还是through?themanwassuccessful()hishardwork填by还是through?themanwass

the man was successful () his hard work填by还是through?
the man was successful () his hard work
填by还是through?

the man was successful () his hard work填by还是through?
填 through

选through这里表示通过自己的努力,用through而by表示通过方式,方法