It is difficult to judge whether what he said_________.A.is worth to be praisedB.is worthy being praisingC.is worthy of being praisedD.is worth being praised
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C解析动名词表示反复发生的动作，不定式表示一次性的动作，be worth后的动名词要用主动表被动。与worth相似的worthy却不一样，其后不接动名词而接不定式(若接动名词则其前应有介词of)，且要用被动式表示被动含义。所以选C。