问题
选择题
---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 of thirteen
D．after I was thirteen
答案
答案：A
how long多久,答语中只有选项A与时间长短有关,故选A,从我13岁起,我就在这儿学习了.
