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    By the time , Jim three hundred Chinese characters. A. he was five; had learnt B. he was five; has learnt C. at the age of five; learnt D. when he was five; has 【查看更多】

     

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    By the time ______, Jim _______ three hundred Chinese characters.

    A. he was five; had learnt                    B. he was five; has learnt

    C. at the age of five; learnt                  D. when he was five; has

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