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    Eighteen US adoption agencies mailed the survey to 2,159 families who children from Eastern Europe. A. had adopted B. have adopted C. adopted D. had been adopted 【查看更多】

     

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    Eighteen US adoption agencies mailed the survey to 2,159 families who ________ children from Eastern Europe．


    1. A.
      had adopted
    2. B.
      have adopted
    3. C.
      adopted
    4. D.
      had been adopted

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