Question

The thief was seen ________ something from the shop．

1. A.
   stealing
2. B.
   steal
3. C.
   stole
4. D.
   stolen

Answer 1

A
see sb．do sth．(或see sb．doing sth．)为省略了“to”的不定式．在被动句中可改为：sb．is seen to do sth．或：sb．is seen doing sth．．