题目内容

It is difficult to judge what words are _______ and what words are not.


  1. A.
    worth to look up
  2. B.
    worth being looked up
  3. C.
    worth looking up
  4. D.
    worthy of looking up
C
短语be worth后面要求跟动名词形式,且用主动形式表示被动的意思,而be worthy后的结构为of being done或to be done。
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