1. Those who have visited theGrand Canyon have typically seen layers of sediment in the gaping canyon,with different colors that mark the passage of time like the rings in atree trunk.
(A) seen layers ofsediment in the gaping canyon, with different colors that mark
(B) see layers ofsediment in the gaping canyon, whose different colors mark
(C) been seeinglayers of sediment in the gaping canyon, whose different colors are markers of
(D) been able tosee layers of sediment in the gaping canyon, with different colors marking（D）
(E) seen layers ofsediment in the gaping canyon, marking by different colors
答案D。哪位能详细解释下。谢谢作者: parispings 时间: 2010-10-31 06:51
