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    We had already read the _____ before we operated the machine.

    A. introduction
    B. direction
    C. explanation
    D. instructions
    D
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    科目：高中英语 来源：浙江省期中题 题型：单选题

    We had already read the _____ before we operated the machine.
    [     ]
    A. introduction
    B. direction
    C. explanation
    D. instructions

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