11、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

11、A

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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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