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    【题目】When the lawyer asks you questions about the case, you should be________.

    A．on duty

    B．on guard

    C．on purpose

    D．on watch

    【答案】B

    【解析】句意：当律师问你关于案件的问题时，你应该警觉一点儿。on guard“警惕；揣摩”。

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