填空题

The Curies are best known for their (discover) ______ of radium.

【参考答案】

discovery
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A. 50 dollars. B. 50 yuan. C. 15 dollars. D. 15 yuan.
A. 50 dollars. B. 50 yuan.
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填空题
We never imagined that he (become) ______ a doctor a few years later.
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