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been to表示“曾经去过某地（已回）”。如：-Where were you just now?-I have been to the library.（现在已经回来了。）gone to表示“去了某地（还没回来）”。如：-Where is Jack? -He has gone to the library.（现在还没回来。）而been in表示“呆在某地”。如：I have been in...