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    21、 The brains of human beings have developed quite a lot _________ we have obtained plenty of information available for further research and studies..

         A. when                   B. which        C. that                   D. where

    21、.D

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     The brains of human beings have developed quite a lot _________ we have obtained plenty of information available for further research and studies..

         A. when                   B. which        C. that                   D. where

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