—Why do you look worried?
—Fred left the company half an hour ago. His work ________ unfinished since.
A．leftB．was leftC．has leftD．has been left
D
受前一句left的影響，易誤選B。題干中的since說明此處應(yīng)用現(xiàn)在完成時(shí)態(tài)。從問句中也可看出來，此處強(qiáng)調(diào)動作對現(xiàn)在的影響，故要用現(xiàn)在完成時(shí)的被動式。
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