题目

_____ time went on, Einstein’s theory proved to be correct. A. BecauseB. Which    C. AsD. With   答案：Cas 引导的时间状语从句表示随着…。The teacher seldom let an opportunity to teach his students or to help them make up for the days of schooling they had missed ____.　 　 A. pass B. passing C. to pass D. being passed