it took them over twenty hours to trek()the forest ,which made them very tiredA across B through C among

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it took them over twenty hours to trek()the forest ,which made them very tiredA across B through C among
it took them over twenty hours to trek()the forest ,which made them very tired
A across B through C among

it took them over twenty hours to trek()the forest ,which made them very tiredA across B through C among
b across表示从表面上通过,among主要用于三者或三者以上,其宾语通常是表示笼统数量或具有复数意义的名词或代词.