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Navigators have known for thousands of years that the ocean has variable currents, but it is only in the last half century that a reasonably clear picture has emerged of the patterns and causes of ocean currents.

正确答案: A

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请大家帮帮忙!!GWD17-Q32的A选项!

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楼主
发表于 2009-4-24 18:59:00 | 只看该作者

请大家帮帮忙!!GWD17-Q32的A选项!

Navigators have known for thousands of years that the ocean has variable currents, but it is only in the last half century that a reasonably clear picture has emerged of the patterns and causes of ocean currents.

 

A.      a reasonably clear picture has emerged of the patterns and causes of ocean currents

B.       a reasonably clear picture of the patterns of ocean currents and their causes have emerged

C.      a reasonably clear picture emerged of ocean currents, their patterns and the causes of them

D.      there have emerged a reasonably clear picture of the patterns of ocean currents and what caused them

E.       there had emerged a reasonably clear picture of the patterns of ocean currents and their causes

这题答案说是A,但我不太明白为什么时态上要用has?直接用过去时不会更好么?期盼各位的解答~~~

沙发
发表于 2009-4-25 01:08:00 | 只看该作者
完成时的使用有强调的意味
这里先强调了Navigators have known for thousands of years 明显后面要进行对比,即强调时间上的差异性,所以用完成时
过去时只是平白叙述,没有强调意味。
板凳
 楼主| 发表于 2009-4-25 01:26:00 | 只看该作者
原来有这种知识点啊...谢谢NN指点~
地板
发表于 2009-7-29 15:55:00 | 只看该作者
up
5#
发表于 2009-7-30 15:43:00 | 只看该作者
我光荣的选成了C也是想着应该是一般过去时。但现在看起来根本不通。赶时间真是急剧提高错误率。

个人认为一般过去时和完成时都是可行的。
6#
发表于 2009-8-1 23:47:00 | 只看该作者
up
7#
发表于 2009-8-3 00:27:00 | 只看该作者
up
8#
发表于 2010-1-5 15:57:35 | 只看该作者
In B,D,E, there are no clear and reasonable referent for "their", which can refer back to "the patterns" or "ocean currents". Construction in C is wordy and unidiomatic as well.
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