题目内容
—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
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题目内容
—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