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It is not         to discuss the questions again and again.


  1. A.
    worth
  2. B.
    worthy
  3. C.
    worthwhile
  4. D.
    worthy of
C
解析:
本題考查形容詞。worth用法:be worth + n/doing.;
worthy用法be worthy of +n/being done;
worthwhile用法:It’s worthwhile to do sth/doing sth.句意:這個問題并不值得討論來討論去的。
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