bkk145 wrote:
In the mid-1970’s,since birds were overcome by pollution, and routinely falling from the sky above Los Angeles freeways, this prompted officials in California to devise a plan that reduced automobile emissions.
(A) since birds were overcome by pollution, and routinely falling from the sky above Los Angeles freeways, this prompted officials in California to devise a plan that reduced
(B) since birds that had been overcome by pollution were routinely falling from the sky above Los Angeles freeways,
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