考非谓语,主句说它立刻逃走了,所以是一旦被观察,它立刻逃走
B最合适.这句话的关键还是前后的主语要一致,还要符合逻辑.意思是说：刚一被观察,它就跑掉了.on doing...这里有一怎么样就...的意思.A没有那种紧迫感,如果是小动物的话一看见人就会逃之夭夭的吧.
新概念英语上的问题._,it immediately ran away.a.Observing her b.On bei
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