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Because of ________ high demand for Type AB blood, ________ supplies of it are usually limited.

A. the; the B.不填;不填

C.不填;the D. a; the

 

D

【解析】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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