GWD20-26(已查过前人帖)

Q26:

The Organization of Petroleum Exporting Countries (OPEC) had long been expected to announce a reduction in output to bolster sagging oil prices, but officials 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 500,000 barrels a day.

1. year, but only if non-OPEC nations, including Norway, Mexico, and Russia, were to trim output
2. year, but only if the output of non-OPEC nations, which includes Norway, Mexico, and Russia, is trimmed
3. year only if the output of non-OPEC nations, including Norway, Mexico, and Russia, would be trimmed
4. year only if non-OPEC nations, which includes Norway, Mexico, and Russia, were trimming output
5. year only if non-OPEC nations, including Norway, Mexico, and Russia, trim output

Key is E. only if 后面不是要用虚拟语气？

对！

不對吧？在此only if表達一種條件的成立，也就是要假設後面為真後，前面的事情才可能發生

所以選E

如果only if 后用虚拟,为什么不选C?

因为c是被动语态啊，在意思相同的情况下ets一般不prefer把主动语态改为的被动，而且改了之后罗嗦，