[求助]大全-53

看了大全注释中关于has already been doing 和is doing的区别, 没有找到依据.

1.        According to the National Pasta Association, per-capita consumption of pasta in the United States, which has already been approaching 19 pounds a year, will achieve 30 pounds a year by the twenty-first century.

(A) According to the National Pasta Association, per-capita consumption of pasta in the United States, which has already been approaching 19 pounds a year, will achieve 30 pounds a year by the twenty-first century. 为什么错?,

(B) Already approaching 19 pounds a year in the United States, the National Pasta Association predicts that per-capita consumption of pasta will reach 30 pounds a year by the twenty-first century.

(C) The National Pasta association predicts by the twenty-first century that per-capita consumption of pasta in the United States, which is already approaching 19 pounds a year, will reach 30 pounds a year.

(D) By the twenty-first century, the National Pasta Association predicts that per-capita consumption of pasta in the United States, having already approached 19 pounds a year, will reach 30 pounds a year.（E）

(E) According to the National Pasta Association, per-capita consumption of pasta in the United States is already approaching 19 pounds a year and will reach 30 pounds a year by the twenty-first century. [E] 时态和原句不一样但是对, ???

大全注释: has already been approaching一般表示达到一年19磅这种状态过去已经存在直到现在但可能还会继续，is already doing 表示现在存在的状态但这种状态可能会变(此时already用于一般时或一般进行时, 意思应该是:used to say that a situation exists and it might get worse, greater, etc)，is already doing 后用and 并列引出will do正好表明这种变化的趋势。所以is already doing and will do可能比has already been approaching和will do的搭配要好些，

我查了语法书,反而觉得has been doing更好. 关于is doing 后面状态可能会改变而has been doing 后面不改变的解释没有找到依据. 请nn 解释一下.

谢谢.

       我觉得时态是个很难琢磨的东西，一般先放一边，最后排除

       比较A，E，至少我觉得E比较好

       A的which实在的不爽，E至少没什么错。我们选择的是比较得出的最好的答案，而不是经的起各种语法书推敲的，没有任何语病的句子

大全注释: is already doing 表示现在存在的状态但这种状态可能会变(此时already用于一般时或一般进行时, 意思应该是:used to say that a situation exists and it might get worse, greater, etc)

好象A,E 的关键区别在于, Already,     already 在一般时或一般进行时里有暗示状态可能改变这种意思吗? 可不可以证实一下?

今天看OG88:

http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=68763

nor the present perfect verb have constituted (in C) is correct , both suggest that the statue's features once constituted an artificial face but no longer do so.

我觉得大全的解释是不是有错误, 这样是不是正确: has already been approaching一般表示达到一年19磅这种状态过去已经存在直到现在但可能不能继续.

如果是这样, 我们可以理解完成时不对.

另外: 完成时是不是都应该这样理解, 事情发生到目前为止, 以后就不继续了?

请NN指正.

lilyzy, OG 88 用的是现在完成时 have done: 过去发生直到现在已经结束了.

        大全53 用的是现在完成进行时, Have been doing. 过去发生,现在还存在, 将来可能还延续.

两个是不一样的.

我认为这不是排除大全A 的理由.  解释中说have been doing 和is already doing 虽然都是持续到将来但, 意思不同. 但我没有找到依据.

open to discussion

这题是我看错了. 两个不一样.

我在google上查了一下, is already approaching的用法. http://www.ottawastart.com/story/910.php

Corporate sponsorship for the week is already approaching the $150,000 mark with over a month remaining until kick-off.

后面有了until, 而这里却没有用完成时. 我想可能是逻辑上的原因, 可是又说不上来.

继续讨论.