My mother has taught in this school she was twenty years old.A. for B. until C. because D. since D [解析]句意:我母亲从二十岁起就在这所学校教书.A. for为.后接一段时间,B. until直到,C. because因为,D. since自从.后接时间点.由句意可知D正确. 题目和参考答案——青夏教育精英家教网——

题目内容

（2017·四川德阳·33）My mother has taught in this school________ she was twenty years old.

A. for B. until C. because D. since

D 【解析】句意：我母亲从二十岁起就在这所学校教书。A. for为，后接一段时间；B. until直到；C. because因为；D. since自从，后接时间点。由句意可知D正确。

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