【題目】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:自從我開始作為一個工程師,工作已經(jīng)有12年了。

考查since的用法。begin動詞原形;began過去式;am beginning現(xiàn)在進行時;have begun現(xiàn)在完成時;根據(jù)since表示“自從”,從句用一般過去時,主句用現(xiàn)在完成時。故選B。

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