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    their country has plenty of oil, ours has none. A. While B. When C. Before D. Where 【查看更多】

     

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    ______ their country has plenty of oil, ours has none.

       A. While                  B. When                  C. Before                D. Where

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    Their country has plenty of oil, __________ ours has none.
    [     ]
    A. when    
    B. while    
    C. before    
    D. where

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