Given more attention,the trees could have grown better.为什么句首不能Having given

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Given more attention,the trees could have grown better.为什么句首不能Having given

主语是the trees,前面的Given more attention,是省略了主语the trees
如果正常说的话应该是the trees are given more attention
give应该是用被动,Having given不能表达被动

given 是说给过了,只强调过去某一时给过。而having given 则强调不仅给过而且已经给完!