Madame Curie is believed ______radium.

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问题 Madame Curie is believed ______radium.

选项 A、discovers
B、having discovered
C、to discover
D、to have discovered

答案D

解析镭被认为是居里夫人发现的。本题目考查的是动词不定式的完成式，首先排除A、B项，因为没有用动词不定式，又因为discover的动作发生在believe之前，因此需要用完成式，故选D。

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本试题收录于：大学英语三级A级题库大学英语三级分类

大学英语三级A级

大学英语三级

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