As it is easily shaped and melted, plastics ________ the place of many other materials.


  1. A.
    has been taken
  2. B.
    have been taken
  3. C.
    have taken
  4. D.
    has taken
D
導(dǎo)解：plastics物質(zhì)名詞作主語，謂語用單數(shù)．
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