A. Class MyDictionary Implements Dictionary （Of String，String）
B. Class MyDictionary Inherits HashTable
C. Class MyDictionary Implements IDictionary
D. Class MyDictionary     End Class     Dim t as New Dictionary （Of String， String）     Dim dict As MyDIctionary= CType （t，MyDictionary）

A. The System.Collections.Generic.SortedList class should be used 
B. The System.Collections.HashTable class should be used
C. The System.Collections.Generic.SortedDictionary class should be used 
D. The System.Collections.SortedList class should be used