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13.Tim ____since he lost his job three weeks ago.(  )
A.had been unemployedB.was unemployed
C.has been unemployedD.has unemployed

分析 自从Tim三年前丢了工作,他一直失业.

解答 答案是C.考查被动语态,Tim与动词unemployment之间是被动关系,since引导时间状语从句时,主句要用现在完成时,所以本题用现在完成时的被动语态,故答案选C.

点评 被动语态由"助动词be+及物动词的过去分词"构成.被动语态的时态变化只改变be的形式,过去分词部分不变.疑问式和否定式的变化也如此.掌握各种时态的被动语态是解题的关键.

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