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The thief was observed ____ things in the supermarket and wa

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The thief was observed ____ things in the supermarket and was caught on the spot
A.steal
B.to steal
C.stealing
The thief was observed ____ things in the supermarket and wa
选C,observe sb.doing sth.发现某人做某事,被动 sb.is observed doing sth.
另有词组:observe sb.do sth.表示经常看到某人做什么事,被动为 sb.is observed to do sth.
再问: observe 表被动时,to要加,那为什么c(没to)也行?
再答: 如果主动时是observe sb. do sth,表示观察某人做某事的整个过程,就是指有意识地去观察别人做某事。被动句要加to。 如果主动时是observe sb. doing sth, 指无意地,恰好看到某人正在做某事,被动句不用加to。