题目内容

—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的影响，易误选B。题干中的since说明此处应用现在完成时态。从问句中也可看出来，此处强调动作对现在的影响，故要用现在完成时的被动式。
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