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    He said he experiments those days. A. was doing B. had been doing C. has been doing D. is doing 【查看更多】

     

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    .He said he _________ experiments those days.

    A. was doing     B. had been doing    C. has been doing    D. is doing

     

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    .He said he _________ experiments those days.

    A. was doing     B. had been doing    C. has been doing    D. is doing

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