有读者问这样一道选择题：
(1)The salesman scolded the girl caught_________and let her off.
A. to have stolen B. to be stealing
C. to steal D. stealing
答案是D，但A是否也对？
A不对,必须选D;因为当catch作“撞见，发觉”解时，其后常接somebody doing something：被动语态亦然，如：
(2)I caught the boy stealing fruit from my orchard.
(3)They were caught trying to cross the frontier at night.
