Sentence Correction
试题详情
题目：
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.
选项:
A、 by which
B、 for which
C、 under which
D、 such that
E、 wherein
答案:
C
