____ by air pollution,acid rain ____ spread everywherea.Caused; has b.To be caused; has 为何选A,B错在哪?

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____ by air pollution,acid rain ____ spread everywherea.Caused; has b.To be caused; has 为何选A,B错在哪?
____ by air pollution,acid rain ____ spread everywhere
a.Caused; has b.To be caused; has
为何选A,B错在哪?

____ by air pollution,acid rain ____ spread everywherea.Caused; has b.To be caused; has 为何选A,B错在哪?
Caused by air pollution,acid rain has spread everywhere.
过去分词短语作状语,已经有被动的意思,不必要用to be caused
受环境污染影响,酸雨已经到处扩散.

原句可以这样讲: Acid rain which caused by air pollution has spread everywhere.
你的句子将原因提前只是表示强调,基本句型不变,主谓宾没有变化,to be caused 是作为谓语时候才这样表示的,但是此句的谓语是has spread.

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