Because of ______ high demand for Type AB blood, ______ supplies of it are usually limited．
A．the; theB．/; /C．/; theD．a(chǎn); the
D
考查冠詞的用法。句意“由于AB型血需求量大，它的供應(yīng)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型血的供應(yīng)，用the。故選D。
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