◎ 题干
—How long have you been studying at this school? 
—I have been studying here_____.
[     ]
A. since I was thirteen years old        
B. when I was thirteen      
C. at the age of thirteen              
D. after I was thirteen
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—How long have you been studying at this school?—I have been studying here_____. [ ]A. since I was thirteen years old B. when I was thirteen C. at the age o…”主要考查了你对  【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。