My mother has taught in this school (since she was less than thirty.)对括号部分提问 （）（）（）your mother（）in this school?
问题描述：
My mother has taught in this school (since she was less than thirty.)对括号部分提问 （）（）（）your mother（）in this school?
答
问某动作持续了多长时间,用 how long:
How long has your mother taught in this school?