单选题 ______ you feel too ill to go out, I would rather not stay at home tonight.
A. Because B. Although C. Unless D. If

【正确答案】 C
【答案解析】这句话的意思是：“除非你病得无法出门了，要不然我今晚还是不愿待在家里。”unless除非；although虽然；if 如果；because因为。