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

分析 自從Tim三年前丟了工作，他一直失業(yè)．

解答 答案是C．考查被動(dòng)語態(tài)，Tim與動(dòng)詞unemployment之間是被動(dòng)關(guān)系，since引導(dǎo)時(shí)間狀語從句時(shí)，主句要用現(xiàn)在完成時(shí)，所以本題用現(xiàn)在完成時(shí)的被動(dòng)語態(tài)，故答案選C．

點(diǎn)評 被動(dòng)語態(tài)由"助動(dòng)詞be+及物動(dòng)詞的過去分詞"構(gòu)成．被動(dòng)語態(tài)的時(shí)態(tài)變化只改變be的形式，過去分詞部分不變．疑問式和否定式的變化也如此．掌握各種時(shí)態(tài)的被動(dòng)語態(tài)是解題的關(guān)鍵．

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