2. 外语
  3. At the international conference, the scientist gave a report (base) ______ on his recent experiments.

At the international conference, the scientist gave a report (base) ______ on his recent experiments.

admin2009-06-28  19
问题 At the international conference, the scientist gave a report (base) ______ on his recent experiments.
选项
答案based
解析 本句中，主语是the scientist，谓语是gave，因此base需要变成非谓语动词的形式，report和base之间是被动关系，所以采用过去分词。
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