cottoned, cotton, cottoning; of, for, withAlthough I always wear

cottoned, cotton, cottoning; of, for, with
Although I always wear ______shirt, I never see a field ______ cotton.
【正确答案】：cotton / of
【题目解析】：考查Conversion（转化法）。名词转形容词：cotton棉，棉花(植株)；棉织物；棉布。