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    The news that scientists so far haven’t found out the cause of bird flu discouraged some WHO officials, ? A. didn’t they B. did it C. didn’t it D. did they 【查看更多】

     

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    26. The news that scientists so far haven’t found out the cause of bird flu discouraged some WHO officials,________?   

       A. didn’t they           B. did it          C. didn’t it        D. did they

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    26. The news that scientists so far haven’t found out the cause of bird flu discouraged some WHO officials,________?  

    A．didn’t theyB．did itC．didn’t itD．did they

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