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He devoted all the time _____ his research .


  1. A.
    to do
  2. B.
    doing
  3. C.
    to doing
  4. D.
    did
C
試題分析：考查詞組：devote all the time to doing，致力于做…,句意：他所有時間都致力于他的研究。選C。
考點：考查詞組
點評：英語中有的詞組的to是介詞后面要接動名詞做賓語，如：be used to doing，look forward to doing等，不要和不定式混用。
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