题目

He said he didn’t regret telling the truth but felt that he ______ it differently. A. could have expressed  B. could express  C. must have expressed D. would express 答案：A 解析: 略已知函数，. （Ⅰ）求函数的单调区间； （Ⅱ）当时，都有成立，求实数的取值范围.