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  3. At the international conference, the famous scientist gave an excellent report ______ on his recent experiment.

At the international conference, the famous scientist gave an excellent report ______ on his recent experiment.

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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 本题测试过去分词。本句为过去分词短语作后置定语，并且 base 与其修饰的 report之间是动宾关系，因此用过去分词。be based on/upon：基于……，建立在……基础上。本句大意：在那次国际会议上，这位著名科学家就他最近的实验作了精彩的报告。
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