Joan saw her boyfriend off at the railway station. She waved until the train was .A. in si

问题补充：

Joan saw her boyfriend off at the railway station. She waved until the train was .

A. in sight

B. out of sight

C. at first sight

D. lost sight

答案：

A. in sight

(答案→)B. out of sight

C. at first sight

D. lost sight

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。