标题: 请大家帮帮忙啊。。。这个问题颠覆了我对现在完成时的理解。。 [打印本页] 作者: 萧尧 时间: 2011-11-9 22:55 标题: 请大家帮帮忙啊。。。这个问题颠覆了我对现在完成时的理解。。 10、Carnivorous mammals can endure what would otherwise be lethal levels of body heat because they have a heat-exchangenetworkwhich kept the brain from getting too hot.
which kept
that keeps
which has kept
that has been keeping
having kept
A Kept is the wrong tense. B Correct. The verb keeps indicates a current situation and is consistent with the other verbs in the sentence. The sentence is clear and concise. C Mistaken shift in tense: In this sentence the present tense expresses a timeless general principle; in contrast, has kept indicates a more definite context and time period and suggests that the heat-exchangenetwork mayno longer have this effect. D Has been keeping is the wrong tense. 我理解的现在完成时是：过去发生，持续到现在，并且对现在产生影响。可是与C的红字说法部分相悖啊。大家给我解答一下好不好？作者: rain424124 时间: 2011-11-10 06:14
为什么是过去发生。。。作者: miss绿光 时间: 2012-2-6 00:03
顶起，不明白OG这里的解释~作者: longwayahead 时间: 2012-2-6 09:22
我选的是B我觉得是陈述一般客观事实作者: yiayia 时间: 2012-2-6 09:39
对现在完成时有情况： 1.means one action that started in the past but countinue into the present, or remain true in the present. 2.sometimes, means that the action is definitely over, but its effects still revelent t othe present moment. 这两种情况用在C选项都是可以，所以OG解释用 may no longer 关键在于和longway说的一样，这题是陈述一般事实，和无论现在还是过去，或者未来都没有关系，这一事实一直存在，采用一般现在时来描述。作者: hlaboratory 时间: 2012-2-6 12:18
窃以为是称述一般事实，且从语法规则上都是一般现在时，也没有必要用完成时。
