单选题 —How about your trip to Hainan?
—It couldn"t have been ______. Sometimes I went swimming in the sea; sometimes I lay on the sand.
【正确答案】 C
【答案解析】[解析] 根据前后文句意可推知去海南的旅行非常愉快，此处是比较级的否定式表达最高级的含义，意思是“不能再好了”。