Joan saw her boyfriend off at the railway station. She waved until the train was ______.A.in sightB.out of sightC.at first sightD.lost sight
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B解析考查词组辨析：A. in sight在视野内，B. out of sight看不见，C. at first sight第一眼 D. lost sight失明，句意是：琼到火车站给她的男朋友送行，她挥手告别直到火车消失在视野之外。选B。