In the picture,all the trees have been cut down.句子中为什么加been

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In the picture,all the trees have been cut down.句子中为什么加been
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In the picture,all the trees have been cut down.句子中为什么加been
In the picture,all the trees have been cut down.句子中为什么加been

In the picture,all the trees have been cut down.句子中为什么加been
In the picture可以说明这已经完成.
been是现在完成时行式.have been意为已经.懂了吗.