[文法] move on to working

[whisperwin (都好)]

For some, the first experience can be as simple as raising a pet.
From there, they might move on to working with farm animals──
or volunteering at a local zoo or animal shelter.

想請問move on後面不是直接加名詞(或動名詞)就好了嗎?
為什麼文章中, 會特別用to working呢?

這是從空英的文章摘錄下來的, 近日試著用精讀自我訓練, 覺得這段怪怪的.

怕這是國中程度的英文......唉

感謝大家願意花時間回答~

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→ dunchee:http://www.ldoceonline.com/dictionary/move_1
→ dunchee:找 move on (phrasal verb) -> move on to(例句也要看)
→ memorabilia:to 是介系詞
→ whisperwin:謝謝樓上兩位!! ^^