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It is not         to discuss the questions again and again.
A.worthB.worthyC.worthwhileD.worthy of
C
本题考查形容词。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:这个问题并不值得讨论来讨论去的。
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