— "Why do you look worried?" — "Fred left the company half an hour ago. His work______unfinished since."

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问题 — "Why do you look worried?" — "Fred left the company half an hour ago. His work______unfinished since."

选项 A、left
B、was left
C、has left
D、has been left

答案D

解析 时态、语态。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。leave sb./sth.+现在分词/过去分词,可表示“使……处于某种状态”。
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