[求助]GWD 17-31

best_tu

Q31.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.

by which

for which

under which

such that

wherein

  这题选C,是不是用了什么习惯用语啊??

求教

疯狂鳄鱼

在某种协议或者草案下，要用 under protocol不能用 by protocol

ivymxy

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