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    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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