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    精英家教网 > 高中英语 > 题目详情
    In the experiment we kept a watchful eye __________ the development and recorded every detail.
    A．with
    B．on
    C．for
    D．to
    B
    考查固定短语keep an eye on, 意为“注视（密切注意）……（的举动）”。
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