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 |
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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 |
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