------,it immediately ran away.B.On being observing C.Having been observed为什么不选C

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------,it immediately ran away.B.On being observing C.Having been observed为什么不选C

------,it immediately ran away.B.On being observing C.Having been observed为什么不选C
------,it immediately ran away.B.On being observing C.Having been observed
为什么不选C

------,it immediately ran away.B.On being observing C.Having been observed为什么不选C
一被注意到,它就立即跑掉了.
on doing=as soon as...do...一……就……
相当于:As soon as it was observed,it immediately ran away.
又如:On hearing this,I jumped up.
如果选C,从语法结构而言,也是可以的,但没有表达准确(因为这里有immediately).
已经被注意到,它就立即跑了.(意思不太合适)

如果it主语不是指的Havin的话,肯定就要在前面加上它自己的主语,如果前后两个主语一样的话,前面可以省去主语和系动词,然后主动ing,被动ed
英语高考必备这本书后面语法分析那块讲过这个的,推荐你看看我能告诉你我没听懂么...额我给你写两个句子你看看
peter being away,we have to cancl this plan.
we和peter不是同一个人,所...

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如果it主语不是指的Havin的话,肯定就要在前面加上它自己的主语,如果前后两个主语一样的话,前面可以省去主语和系动词,然后主动ing,被动ed
英语高考必备这本书后面语法分析那块讲过这个的,推荐你看看

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