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Madame Curie is believed ______radium.A、discoversB、having discoveredC、to disco
Madame Curie is believed ______radium.A、discoversB、having discoveredC、to disco
游客
2023-09-26
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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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