答案：D sadly 难过地,副词修饰动词beg（乞讨）.上一句是 Adult bears are _____ than most other animals because they can think of something. A: more friendly, B: prettier, C: cleverer, D:not cleverer答案C 更聪明have you seen how _____ they beg for sweets and food in the zoo A: clever, B: sad, C: cleverly, D:sadly答案：C 解释：根据上下文来判断，这里用cleverly 聪明地。