It is not         to discuss the questions again and again.
A．worthB．worthyC．worthwhileD．worthy of
C
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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