题目内容
My brother has been teaching ________ he was 21 years old.
A. when???????? ????????????? B. if ????????? ????????????? C. for????????? ????????????? D. since
【答案】
D
【解析】
试题分析:主句用的是现在完成时态。since,自从……(到现在)现在完成时的标志词。句意:我的弟弟自从21岁就一直在教学。
考点:考查连词。
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