Difficult _____ in practice, this new technique hasn’t been applied


  1. A.
    operated
  2. B.
    to be operated
  3. C.
    operating
  4. D.
    to operate
D
試題分析：此處相當于because it is difficult to operate in practice，省略because it is之后就變成了 difficult to operate in practice. 句意：因為這種新技術(shù)很難在實踐中操作，所以它沒有被應用。
考點：考查非謂語動詞的用法。
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