题目

---When did Kate’s grandma die?    ---While the doctors______ on her.    A. are operating   B. were operating   C. operate   D. operated 答案：B若a>b>1，P＝，Q＝（lg a+lg b），R＝lg（），则（　　） A.R＜P＜Q                     B.P＜Q＜RC.Q