问题
选择题
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
答案：C
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。