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    7．When asked to explain         made her remain so young，she began to teil us her secret．（　　）
    A．what it was thatB．that what was it
    C．it was what thatD．what was it that

    分析 当被要求解释到底是什么让她保持这样年轻时，她开始告诉我们她的秘诀．

    解答 答案：A
    题干中made her remain so young是作explain的宾语，是一个宾语从句；从句中made缺少主语，要用连接代词；宾语从句中，从句要放的连词后且要用陈述句语序；it was that构成强调句型，对what进行强调，不影响句子结构．故选A．

    点评 在句子中起名词作用的各种从句统称为名词性从句．根据它们在句中的语法作用，这类从句又可分为主语从句、同位语从句、表语从句和宾语从句． 本题中what在宾语从句中起连接作用，同时又充当了从句的主语．

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