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张五大叔 · 发表于 2012-10-28 10:45:59

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.same as A

C.birds had been overcome by pollution and routinely fell from the sky above Los Angeles freeways, prompting officials in California
to devise a plan that reduced
D.birds overcome by pollution routinely fell from the sky above Los Angeles freeways, prompting officials in California
to devise a plan to reduce
E.birds overcome by pollution and routinely falling from the sky above Los Angeles freeways, were prompting officials in California
to devise a plan to reduce

选哪一个，其他的错在哪里？

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