At the international conference, the scientist gave a report (base) ______ on hi

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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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