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[Sentence Correction]
试题详情
题目：
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.
选项:
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, it prompted officials in California to devise a plan that would reduce
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
答案:
D
提问：
错选B。理解的句意是：因为鸟被污染物所战胜从天上掉下来这件事儿，导致prompt official制定一个plan.
A：that reduced 排除
B：感觉有因果关系选了B，请问老师在语法中，逗号后面的it prompted不能指代逗号前面这件事吗？ 如果改成"comma+prompting"是不是就可以了？
C： had been overcome 排除
D:现在看来D确实读着清晰一些
E：were prompting杀
还请老师看下我对选项的理解哪里有误。
以及，不考虑指代是否清晰的情况下，“it prompted”和“comma + prompting”这两种用法，修饰前一句的区别在哪里。
解答：
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