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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

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

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