選C,observe sb.doing sth.發(fā)現(xiàn)某人做某事,被動(dòng) sb.is observed doing sth.
另有詞組：observe sb.do sth.表示經(jīng)常看到某人做什么事,被動(dòng)為 sb.is observed to do sth.observe 表被動(dòng)時(shí)，to要加，那為什么c（沒(méi)to）也行？如果主動(dòng)時(shí)是observe sb. do sth，表示觀(guān)察某人做某事的整個(gè)過(guò)程，就是指有意識(shí)地去觀(guān)察別人做某事。被動(dòng)句要加to。如果主動(dòng)時(shí)是observe sb. doing sth， 指無(wú)意地，恰好看到某人正在做某事，被動(dòng)句不用加to。
The thief was observed ____ things in the supermarket and was caught on the spot
The thief was observed ____ things in the supermarket and was caught on the spot
A.steal
B.to steal
C.stealing
A.steal
B.to steal
C.stealing
英語(yǔ)人氣：293 ℃時(shí)間：2020-03-20 01:09:56
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