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

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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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Aservantortwoorthree______toaccompanythem.A、isB、areC、beingD、wereA主谓一致