题目内容
【题目】My uncle has been taught in this school _______ he was twenty years old.
A. since B. for C. until D. after
【答案】A
【解析】试题分析：句意：我的叔叔自从二十岁的时候就一直在这所学校教。此题考查现在完成时，根据句意，故选A。
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