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GWD17-Q31~答案求证，求证！
The agreement, the first to formally require industrialized countries to cut emissions of gases linked to global warming, is a formal protocol by which 38 industrialized countries must reduce emissions of these gases by 2012 or face heavy penalties.
A. by which
B. for which
C. under which
D. such that
E. wherein
这道题答案是C吧，是不是GWD答案又错了？ |
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