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

问题补充：

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

A. introduces

B. to introduce

C. introducing

D. introduced

答案：

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。