At the international conference, the famous scientist gave an excellent report__

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问题 At the international conference, the famous scientist gave an excellent report______ on his recent experiment.

选项 A、basing
B、based
C、to be based
D、to base

答案 B

解析本题考查的是过去分词作后置定语。过去分词短语表示：(1)被动；(2)动作已经完成。report与base之间是逻辑上的被动关系，因此用过去分词表示，故B项为正确答案。

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Theobjectiveofthisreportistosummarizetheachievementswe’vemadeaswell