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    By the time Einstein was 14 years old, he himself advanced mathematics. A. has taught B. taught C. had taught D. was teaching 【查看更多】

     

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    By the time Einstein was 14 years old, he ________ himself advanced mathematics.

           A. has taught                                     B. taught

    C. had taught                                     D. was teaching

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    By the time Einstein was 14 years old, he ________ himself advanced mathematics.
     A. has taught      B. taught 
    C. had taught      D. was teaching

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    By the time Einstein was 14 years old, he_______ himself advanced mathematics.

    A. has taught　 B. taught

    C. had taught　　 D. was teaching

     

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