________ is easy to work out the maths problem.


  1. A.
    This
  2. B.
    That
  3. C.
    It
  4. D.
    Its
C
解析：
it為形式主語。
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科目：初中英語 來源：2011年山東省德州市中考英語試卷（解析版） 題型：閱讀理解


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