题目内容

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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