The doctor must be _______ 24 hours a day, 7 days a week in the boarding school.
题型：不详难度：来源：
The doctor must be _______ 24 hours a day, 7 days a week in the boarding school. | A．on call | B．by hand | C．in sight | D．on spot |
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答案
| 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。 |
举一反三
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