题目内容

Edison was a great ____. His ____ are very useful.


  1. A.
    inventer; invent
  2. B.
    inventor; inventions
  3. C.
    inventor; invention
  4. D.
    inventer; inventions
B
该题考查词形与词义的变化。invent v.“发明”,invention n.,“发明”;inventor n.,“发明者”。
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