It is worth considering what makes “convenience” foods so popular, and better ones of your

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A. introduces
B. to introduce
(答案→)C. introducing
D. introduced
解析： 考查短语: 值得做某事 be worth doing,此题中前面句式是It is worth considering，and 后的句子与前面的句子结构相同，也是It is worth，后用doing，所以选C。