og 12 sc 14

sissiswufe · 发表于 2011-2-27 10:36:05

Sunspots, vortices of gas associated with strong
electromagnetic activity, are visible as dark spots on
the surface of the Sun but have never been sighted on
the Sun’s poles or equator.
(A) are visible as dark spots on the surface of the
Sun but have never been sighted on
(B) are visible as dark spots that never have been
sighted on the surface of the Sun
(C) appear on the surface of the Sun as dark spots
although never sighted at
(D) appear as dark spots on the surface of the Sun,
although never having been sighted at
(E) appear as dark spots on the Sun’s surface,
which have never been sighted on

有没有nn可以告诉我为什么用一般完成时的被动形式啊？？答案a

annazyan · 发表于 2011-2-27 20:49:15

额首先不是nn 我也才接触gmat
我的理解是 have done是延续至今的时间下的用法
这里是在pole和equator至今没有被看到
所以用一般完成时
然后被动式因为被看见
我只是新人来讨论讨论
请大神们来指正！！

sissiswufe · 发表于 2011-3-1 14:19:11

ddddddddddd

mikydai · 发表于 2011-3-1 15:44:23

b不符合题目意思，c不是被动，d时态不对，e which 指代错误

orochiaiacos · 发表于 2011-3-1 21:45:53

为什么og说C although 后面缺主谓语啊？状语从句不是可以省略么？

sissiswufe · 发表于 2011-3-3 08:47:02

为什么og说d having been sighted不是一个完整的动词短语啊？？？

FactOrFiction · 发表于 2011-3-17 21:27:05

我看OG解释应该意思是Although后面应该要加完整的主谓结构, 不能省略. 还没有看完OG, 所以不知道后面有没有题例外.

og 12 sc 14

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