题目内容
My brother has been teaching ________ he was 21 years old.
| A．when | B．if | C．for | D．since |
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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