摘要： in→by
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By 1909, Picassohad ________ himself as a painter of great talent in Paris.
- A.made
- B.recognized
- C.admitted
- D.established
By careful observation and precise calculation, Nicolaus Copernicus _____ that there is no one center in the universe and the sun is the center of the solar system.
- A.believed
- B.thought
- C.concluded
- D.imagined
In the beauty competition, women are asked ________ some of the exercises ________ the music．
- A.performing; to
- B.performing; with
- C.to perform; to
- D.to perform; by