求问OG16-SC36

考GMAT耶

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

The underlined part of this sentence deals with the conditions under which OPEC
members will lower their own oil production by 1.5 million barrels by the
beginning of next year. The important thing to notice here is the following logical
relation: X will do something only if Y does something else.
A This version has redundant words, were to in front of trim that do not add
anything more in meaning. Furthermore, were to trim is not the proper verb
form to accompany will pare. The addition of but before only is also
redundant.
B This version uses the passive construction in the conditional clause only if
the output . . . is trimmed. This use of the passive voice makes this sentence
vague; it is now unclear who needs to trim the output of non-OPEC nations.
Finally, the addition of but before only is redundant.
C As in (B), this version also introduces vagueness by using the passive
construction. In addition, would in front of the passive verb be trimmed is
redundant.
D This version uses an active verb, but in the past progressive form, were
trimming. The progressive tense denotes actions in progress, so its use is
not normally warranted in conditional sentences such as this one.
E Correct. This version uses the correct and most concise conditional

structure, without redundancies.

对答案本身没有疑问，对OG解析有一点点的疑惑，我想问一下B选项中的which不是用来指代non-OPEC nations嘛？那么是不是 which includes应该改为 which include？因为OG答案中没提到这个错误，不知道是它忘了提及还是我自己想错了呢？

Bradz

应该是他忘了。

Fiona09

LZ思考的没有错！非限制性定语从句中的which，一般情况下会就近修饰。在“A of B, which”这个特殊例子中，到底指代谁是要看语义，由语义决定。B中which后面都是说的国家，那么肯定是指代non-OPEC nations，所以也应该主谓一致。

考GMAT耶

好的！谢谢两位！