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

解析此题为过去分词短语做后置定语，并且base与其修饰的report之间是动宾关系，因此用过去分词。

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