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    29、The scientists are trying to find out what ______ caused the dolphins to strand themselves, a strange animal behavior hard to understand.

         A. was it that            B. that was that    C. was that which      D. it was that

                 

     

     

    29、D  

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    The scientists are trying to find out what ______ caused the dolphins to strand themselves, a strange animal behavior hard to understand.

         A. was it that            B. that was that    C. was that which      D. it was that

                 

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