2. Those who have visited the Grand Canyon have typically seen layers of sediment in the gaping canyon, with different colors that mark the passage of time like the rings in a tree trunk.
(A) seen layers of sediment in the gaping canyon, with different colors that mark
(B) see layers of sediment in the gaping canyon, whose different colors mark
(C) been seeing layers of sediment in the gaping canyon, whose different colors are markers of
(D)been able to see layers of sediment in the gaping canyon, with different colors marking
(E) seen layers of sediment in the gaping canyon, marking by different colors
晕， 我看了这个帖子， 说是sc1000的答案错了， 应该是a。。。 他还有一个官方的解释， 不知道是不是这样 http://www.beatthegmat.com/doubt-about-the-q985-1000sc-t1018.html 我也选了a， 觉得have seen比have been able to see要好，
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发表于 2009-12-26 23:16:45
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