og 上的一道困惑题求大家解答！！谢谢各位了！！

joanna5200 · 发表于 2013-5-14 18:41:56

the organization of Petroleum Exporting Countries(OPEC）had long been expected to announce a reduction in output to bolster sagging oil prices, but officals of the organization just recently announced that the group will pare daily production by 1.5 million barrels by the beginning of next year, but only if non-OPEC nations, including Norway,Mexico, and Russia, were to trim output by a total of 500000 barrels a day.
正确答案：year only if non-OPEC nations, including Norway,Mexico, and Russia,trim output
有一个选项：year obly if the output of non-OPEC nations, including Norway,Mexico, and Russia, would be trimmed. 实在想不通为啥这个选项，还有原句都是错的呀？？大家帮帮忙~~帮忙解答一下吧~~谢谢大家了！！！

og 上的一道困惑题求大家解答！！谢谢各位了！！

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og 上的一道困惑题求大家解答！！谢谢各位了！！