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

試題分析：考查介詞短語：A. on call隨叫隨到，待命，B. by hand在手邊，C. in sight在視野以內(nèi)，D. on spot在出事地點，句意：在寄宿學(xué)校，這個醫(yī)生必須一星期7天一天24小時待命。選A。
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