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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：
A选项的this指代不清
B选项的it也指代不清
E选项的动词形式有问题
最后剩下C，D两个选项徘徊，听了老师以前的音频，还是不太明白两点，第一点是：音频中C选项错误的地方是因为鸟儿是主语，所以不能推动政府，但是D选项的主语也是鸟儿。第二点是：C选项和D选项的一个差异点是时态。C选项是过去完成时态，是发生在过去的过去，可以这样理解么，“鸟儿在它弄下来之前被打败了”如果这样理解的话，这个时态不就没有错了么？
解答：
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