There are a lot of words that have same meanings but are different. In this case, つつ is more of a writing language, so it's more formal I guess? Seriously speaking though, I've passed N1 at 158/180, but I still don't know a lot of these. You don't really need to.
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とんでもないです
チッ
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u did not
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日本語も上手ですか?
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クソオオ 腹が立つ
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