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

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 callB.by handC.in sightD.on spot

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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