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------,it immediately ran away.B.On being observing C.Having

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------,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)