—How long have you been studying at this school?—I have been studying here ________.

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

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A

记述	出处
“臣（丞相李斯）请史官非秦记皆烧之”。“于是使御史悉案问诸生（求药的方士）……皆坑之咸阳，使天下知之，以惩后”。	《史记·秦始皇本纪》
“秦既焚书……诸生贤儒皆至焉，方相难不决，因发机，（伏弩射杀）从上填之以土，皆压，终乃无声也。”	《诏定古文尚书序》
“及秦始皇兼并天下，燔诗书，杀术士，六学从此缺矣。”	《汉书·儒林传》
“秦（秦始皇）燔五书，坑杀儒士，五经之家所共闻也”	《论衡·谢短记》