参考答案

正确答案：D
解析：此处应是名词，alternative n 抉择；选择余地：I wanted to go out, but I had no money. I had no alternative to staying at home. 我想出去，可是没钱；只能待在家里。exchange n. (1) 交换，互换：He gave me an apple in exchange for a cake. 他给我一个苹果，换一块蛋糕。(2) 电话总机交换台(telephone exchange) (4) 交易所the Stock Exchange股票交易所。substitute n. 替代人；替代物；代理人