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There having been no rain,the ground was dry.

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There having been no rain,the ground was dry.
为何用having...
There having been no rain,the ground was dry.
这个是独立主格结构,前面的是对后面的说明.
所以前面的不能有谓语动词,必须用分词形式出现.
再加上是完成时态,所以应该用have been
所以就是having been来表示独立主格结构.