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    16．We have made _______great progress in the medical field，but ______ progress we have made is not enough．（　　）
    A．a； aB．a； theC．/； theD．/；/

    分析 我们已经在医学领域取得巨大进步，但我们取得的这些进步还不够．

    解答 答案选C．第一空为固定搭配，make great progress，意为"取得巨大进步"．第二空为特指，指代我们所取得的这些进步，由其后的"we have made"修饰，故用定冠词the．

    点评 熟记常见搭配，make progress中不用冠词．

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