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mr.smith works in an auto company,but he ___ for this indust

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mr.smith works in an auto company,but he ___ for this industrial exhibition,since he is on leave.
A.has worked B.worked C.has been working D.is working
mr.smith works in an auto company,but he ___ for this indust
Mr. smith works in an auto company,but he ___ for this industrial exhibition,since he is on leave.
A.has worked B.worked C.has been working D.is working
答案为什么选D ?
答:本题考查时态.需要理解整句话的意思和逻辑,特别是最后这个since从句的意思.
译:史密斯先生在一家汽车公司工作,不过他现在正在为这次工业展览干活,因为他要跳槽.