【单项选择题】
You need to select a class that is optimized for key-based item retrieval from both small and large collections.<br /> Which class should you choose？（）<p> You need to select a class that is optimized for key-based item retrieval from both small and large collections.<br /> Which class should you choose？（）</p>
A、A.OrderedDictionary class
B、B.HybridDictionary class
C、C.ListDictionary class
D、D.Hashtable class
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