At the time of the earthquake Jeff was still in his office. He ________ to finish a project before he left for the day.
A．has triedB．had triedC．has been tryingD．had been trying
D
指從發(fā)生地震之前的某一時候開始到發(fā)生地震時一直在努力完成一項(xiàng)計劃，并且在發(fā)生地震時依然在辦公室努力完成這一計劃，所以要用過去完成進(jìn)行時。
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