12、Because of     high demand for Type AB blood,        supplies of it in blood banks are usually limited.

A.the; the           B.a(chǎn); the            C.不填; the           D.不填; 不填

12、A

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

A.the; the           B.a(chǎn); the            C.不填; the           D.不填; 不填

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