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．考查被動語態(tài)，Tim與動詞unemployment之間是被動關(guān)系，since引導(dǎo)時間狀語從句時，主句要用現(xiàn)在完成時，所以本題用現(xiàn)在完成時的被動語態(tài)，故答案選C．

點評 被動語態(tài)由"助動詞be+及物動詞的過去分詞"構(gòu)成．被動語態(tài)的時態(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．掌握各種時態(tài)的被動語態(tài)是解題的關(guān)鍵．

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