题目

对于实数a和b，定义运算“*”：,设，且关于x的方程恰有三个互不相等的实数根，则实数的取值范围是(      )  A.          B.        C.     D. 答案：D— Why did you arrive so early today, Eric?— My mother early.A.woke up meB.wakes me upC.woke me upD.wakes up me