During his campaign , he debated McCain twice , once in Tucson and once in Flagstaff .
During his election campaign , he twice debated McCain , once in Tucson , and once in Flagstaff .
During his election campaign , he twice debated McCain , once in Tucson , and once in Flagstaff .
이 문장을 바꿔보세요: During his campaign , he debated McCain twice , once in Tucson and once in Flagstaff . 산출: