He still had to work hard for 12 years before___(get)a chance to go into

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Hestillhadtoworkhardfor12yearsbefore___(get)achancetogointoHestillhadtoworkhardfor12yearsbefore___(g

He still had to work hard for 12 years before___(get)a chance to go into
He still had to work hard for 12 years before___(get)a chance to go into

He still had to work hard for 12 years before___(get)a chance to go into
getting,before是介词,介词后动词需要用ing形式.