Question

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

1. A.
   in sight
2. B.
   out of sight
3. C.
   at first sight
4. D.
   lost sight

Answer 1

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。