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    3．Jack，along with his classmates，was working （work） on the project when the teacher came in．

    分析 当老师进来时，杰克和他的同学正在做这个项目．

    解答 答案：was working
    根据句式，along with 联接两个并列主语时，谓语根据前面的主语来判断，即Jack是句子主语，谓语用单数．再结合句意，当老师进来时，他们正在做．故用过去进行时．

    点评 考察在具体语境中使用进行时态．

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