Standing on the platform of the railway station, the old father waved and waved until he ________ his daughter．

1. A.
   lost sight of
2. B.
   lost his sight of
3. C.
   was out sight of
4. D.
   lost the sight of

 Standing on the platform of the railway station, the old father waved and waved until he _______his daughter.

A. lost sight of                      B. lost his sight of   

C. was out sight of               D. lost the sight of