987-985 谢谢

fern

1.                             ?987-985 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.fficeffice" />

(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（D）

(E) seen layers of sediment in the gaping canyon, marking by different colors

为什么要用been able to?

with different colors marking而不用with different colors that mark除了简洁还有没有什么原因?

dreadpower

         这种情况是维持的，而非一次性的，用分词


         be able to我也不知道为什么，感觉从句子意思上也说的通。


         但是不是说情态动词类不能随意添加的吗？？？


         我发现ETS老给这样的选项，对，但是看了不爽


                                                                                                                                                                                             看的爽，但是有错误

Chamao

以下是引用dreadpower在2004-2-24 21:51:00的发言：
         这种情况是维持的，而非一次性的，用分词



         be able to我也不知道为什么，感觉从句子意思上也说的通。


         但是不是说情态动词类不能随意添加的吗？？？


         我发现ETS老给这样的选项，对，但是看了不爽


                                                                                                                                                                                             看的爽，但是有错误

Actually, I am not too sure whether to add be able to. However, if I were to ask to explan, I can only say that be able to means a different meaning from that in other options. XXXhave seen is different with XXXhave been able to see because the prior suggest all of the people could see, while the latter suggests XX can see.


Any NN could help on this one? It really beats us!

Snazzy

1,BE able to --- kind of ability

can -- kind of possibility

here 'be able to' is employed simply because visiters need to have the ability to notice sediment and tell the passage of time.



2, a testing point. I agree with dreadpower.