题目

 The discovery of new evidence led to __________. A. the thief having caught             B. catch the thief   C. the thief being caught              D. the thief to be caught 答案：C已知是(-∞，+∞)上的减函数，那么a的取值范围是 [     ]A、(0，1)B、(0，)C、[，) D、[，1)