I think it's a wonderful place to live（ ）.

It's really a good place to live in.（ 这句是对的）
注：It's really a good place to live这句不对.因为住在……用live in .
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再问： 但这是教课书上的啊，是不是in可以省略？ I think it's a wonderful place to live.
再答： place 是名词，我认为是印刷有误，LIVE 后应该有IN