◎ 题干
He met many problems ________ he was going over his lessons.      
[     ]
A. before  
B. as soon as  
C. since    
D. while
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“He met many problems ________ he was going over his lessons. [ ]A. before B. as soon as C. since D. while…”主要考查了你对  【从属连词】【状语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。