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【题目】It has been about twelve years since I ________ my job as an engineer.

A.beginB.beganC.am beginningD.have begun

【答案】B

【解析】

句意:自从我开始作为一个工程师,工作已经有12年了。

考查since的用法。begin动词原形;began过去式;am beginning现在进行时;have begun现在完成时;根据since表示“自从”,从句用一般过去时,主句用现在完成时。故选B

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