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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．不填；不填
    C．不填；theD．a; the
    D
    D 考察冠词。句义：由于对AB血型血液的高需求，它的供应受到限制。第一空表示泛指，第二空特指AB型血型的供应。
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