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    精英家教网 > 高中英语 > 题目详情
    Because of ______ high demand for Type AB blood, ______ supplies of it are usually limited．
    A．the; theB．/; /C．/; theD．a; the
    D
    考查冠词的用法。句意“由于AB型血需求量大，它的供应通常有限。”表示泛指用a/an；表示特指用the。第一空表泛指，用a；第二空特指AB型血的供应，用the。故选D。
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