[問題] GWD SC問題
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, 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
可以請問一下為什麼是D嗎? 感謝!!
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