答案是：
✘ I have contributed to develop this new product.
✓ I have contributed to developing this new product.
我們很多時候以為to後面就一定是跟原式，但其實有些情況不是的，例如「contribute to」後面如果跟動詞，該動詞就需要加ing。例如：
I have contributed to developing this new product.還有另外一個常見例子：look forward to 後面也是用ing的，像 I look forward to seeing you.
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