Having failed my English exams, I decided ________ science subjects.


  1. A.
    to concentrate
  2. B.
    to concentrate with
  3. C.
    to concentrate on
  4. D.
    to concentrate to
C
本題主要考查concentrate一詞的搭配用法，從左欄的歸納講析中可以看到，與之連用的介詞on，因此就不難排除A、B、D三項(xiàng)。全句意為“我因英語考試不及格而決心專攻理科”。
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