单选

When in a brown study is used as an idiom, brown cannot be replaced by red, green, etc.This shows that_____.

  • A.many idioms are grammatically unanalysable
  • B.the word order of idioms cannot be inverted or changed
  • C.the structure of an idiom is to a large extent unchangeable
  • D.the constituents of an idiom cannot be deleted or added to
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