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    The doctor must be _______ 24 hours a day, 7 days a week in the boarding school.

    A．on callB．by handC．in sightD．on spot

    A

    解析试题分析：考查介词短语：A. on call随叫随到，待命，B. by hand在手边，C. in sight在视野以内，D. on spot在出事地点，句意：在寄宿学校，这个医生必须一星期7天一天24小时待命。选A。
    考点：考查介词短语

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