It is not______ to discuss the question again and again.

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问题 It is not______ to discuss the question again and again.

选项 A、worth
B、worthy
C、worthwhile
D、worthing

答案C

解析句意：翻来覆去地讨论这个问题没有什么意义。worth的用法：be worth sth．／doing sth．；worthy的用法：be worthy of sth．。由此可知此句只适合词组be worth while to do sth．。因此选C。

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