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标题: GWD1-20 [打印本页]

作者: xyredpoppy 时间: 2009-8-31 16:41
标题: GWD1-20

GWDtt 1-20

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.

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
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
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
birds overcome by pollution routinely fell from the sky above Los Angeles freeways, prompting officials in California to devise a plan to reduce
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

Answer: D

E为什么不对呢？

[此贴子已经被作者于2009/8/31 16:41:01编辑过]

作者: xyredpoppy 时间: 2009-8-31 20:35
顶~

作者: xyredpoppy 时间: 2009-9-1 11:18
再问~

作者: xyredpoppy 时间: 2009-9-2 09:28

那位好心人指点我一下吧~

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