The Mekong River / long / than / the Red River.17/30The Mekong River / long / than / the Red River.The Mekong River is long than the Red River The Mekong River is longest than the Red River The Mekong River is longer than the Red River The Mekong River are longer than the Red RiverGiải thíchĐáp án đúng là C