The ability ( )an idea is as impotant as the idea

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ability :表示有能力做某事或具有做某事的能力等,其后通常要接不定式.但在现代英语中,也可后接 of doing sth.例如：He has the ability to speak English fluently.I admire his ability of doing the work quickly.因此选C
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供参考答案1:
选C。to express an idea作the ability的定语。此句译为“表达想法的能力与想法本身一样重要”。