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he has been to China four times还是for four times

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he has been to China four times还是for four times
he has been to China four times还是for four times
都没错, 但for 常省去



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再问: 但答案里没有for 原题Angel knows a lot about China as she has been to China ____-- A for the fourth time B four times C a fourth time Dfor four times 另,A,D 为何不对?
再答: 这里强调的是“总次数”,而不是第几次,因为次数多,所以主语才对中国非常了解。所以最佳答案为B