语法题一道请大牛帮忙

司马忆云 · 发表于 2012-10-20 10:19:58

GWD7-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.

A.year, but only if non-OPEC nations, including Norway, Mexico
, and Russia, were to trim output
B.year, but only if the output of non-OPEC nations, which includes Norway, Mexico
, and Russia, is trimmed
C.year only if the output of non-OPEC nations, including Norway, Mexico
, and Russia, would be trimmed
D.year only if non-OPEC nations, which includes Norway, Mexico, and Russia
, were trimming output
E.year only if non-OPEC nations, including Norway, Mexico
, and Russia, trim output

这道题我选了C，答案E, 这里only if后面为什么不用虚拟语气呢？

wyw1018 · 发表于 2012-10-20 11:12:30

条件从句里面不能用将来时态，用一般现在时表示一般将来时，一般过去时表示过去将来时。
主句里用的是will，所以条件从句用一般现在时。

语法题一道请大牛帮忙

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