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?
• ——“Have you ever been to New York?” ——“Yes,I ______ there twice.It’s a modern city.”“Have you ever been to ” “Yes,I ______ there twice.It’s a modern city.”A.have gone B.have been C.had goneD.have been to
• he failed twice ,but he tried ___ third time.这个答案是A 我想问下可以用THE吗