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    The teacher, along with his students, _____ experiments in the laboratory when the explosion happened.

    A. were doing
    B. have been doing
    C. was doing
    D. had done
    C
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    科目：高中英语 来源：期末题 题型：单选题

    The teacher, along with his students, _____ experiments in the laboratory when the explosion happened.

    [     ]

    A. were doing
    B. have been doing
    C. was doing
    D. had done

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