Those hunters made a lot of money by____(sell) elephants' tasks

Those hunters made a lot of money by____(sell) elephants' tasks
Those hunters made a lot of money by____(sell) elephants' tasks

Those hunters made a lot of money by____(sell) elephants' tasks
selling by是介词,后面要接动名词.

selling
by doing sth

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Those hunters made a lot of money by_selling___(sell) elephants' tusk.
那些捕猎者靠贩卖象牙赚了一大笔钱。
by是介词，后面的动词要用动名词形式。