哪位大神能进来解释下

zuoyh

NASA's methodical approach to the exploration of Mars has not yet answered the questions of whether biological life forms ever emerged on Mars and whether, presuming such life forms having left fossil traces to begin with, those traces can still exist in some moist recesses of the cold and arid planet.

• Aand whether, presuming such life forms having left fossil traces to begin with, those traces can
• Band whether, if it is presumed that such life forms left some fossil traces to begin with, can those traces
• Cand whether, presuming such life forms left fossil traces to begin with, those traces
• Dand, presuming such life forms did leave some fossil traces to begin with, if they can
• Eand, presuming such life forms to have left fossil traces to begin with, if they
  

为什么这题选A而不是C呢？

我个人选C的原因是A中 having left这个完成时表达这些生命体从过去到现在都在LEFT FOSSIL， 然后C是过去LEFT，现在不再LEFT了，我觉得更复合啊，而且C跟第一个WHETHER的EVER EMERGED比较平行。

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呵呵，首先申明我不是大牛。这道题如果要我从A和C选的话，我肯定选C。我不知道你的答案是否靠谱哈，我刚才百度搜索了下，有个网站说答案是C，仅供参考哈~~

http://gmatclub.com/forum/nasas-methodical-approach-to-the-exploration-of-mars-has-not-31944.html

zuoyh

谢谢啊~我那个是在**网看到的，当时做了一下发现这题如果选A怎么看都难受

adamzjw

http://www.ptt.cc/bbs/GMAT/M.1337490289.A.058.html

这里个source说ron认为这题是有问题的。

zuoyh

谢了哈~~