I have been to Beijing three times与I have been to Beijing for three times意义一样么?其中的“for”是加不加都可以 还是必须加

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I have been to Beijing three times与I have been to Beijing for three times意义一样么?其中的“for”是加不加都可以 还是必须加

I have been to Beijing three times与I have been to Beijing for three times意义一样么?其中的“for”是加不加都可以 还是必须加
I have been to Beijing three times与I have been to Beijing for three times意义一样么?
其中的“for”是加不加都可以 还是必须加

I have been to Beijing three times与I have been to Beijing for three times意义一样么?其中的“for”是加不加都可以 还是必须加
第二种说法是错的