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    2．--Do you know _____ Mr．Black's address is？
    --He may live at No.18or No.19of Bridge Street．I'm not sure of_____．（　　）
    A．where，whichB．where，whatC．what，whichD．what，where

    分析 --你知道布莱克先生的地址是什么？
    --他也许住在桥街18号或19号．我不确定．

    解答 答案为C．本题考查名词性从句中引导词的运用．what在名词性从句中可做主语、宾语、表语或定语，表示"所、什么"； 第一空的宾语从句中缺少的是表语，故用what；where在句中做状语，由此排除A和B；第二空用which做宾语表示"选择"，答案是C．

    点评 名词性从句考查的关键是连接词的选用和语序，因此，我们首先要搞清从句的性质，掌握各连接词的用法，在此基础上判断．此外，关注名词性从句用陈述语序．

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