I study English by ____(travel)to the English -speaking countries怎样填急

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I study English by ____(travel)to the English -speaking countries怎样填急

I study English by ____(travel)to the English -speaking countries怎样填急
I study English by ____(travel)to the English -speaking countries怎样填

I study English by ____(travel)to the English -speaking countries怎样填急
traveling,因为by是介词,介词后面的动词要加ing

travelling by是介词,然后这个词用ing,trave要双写l