Q6 :TT-GWD 2-34.
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.
A.and whether, presuming such life forms having left fossil traces to begin with, those traces can ？
B.and whether, if it is presumed that such life forms left some fossil traces to begin with, can those traces
C.and whether, presuming such life forms left fossil traces to begin with, those traces
D.and, presuming such life forms did leave some fossil traces to begin with, if they can
E.and, presuming such life forms to have left fossil traces to begin with, if they
请问这个题到底选啥？！ 作者: winny0821 时间: 2011-3-22 06:42
我选C作者: momohe 时间: 2011-3-24 06:49
为什么选C啊 请NN回答
我纠结在AC中间 然后觉得A里有个can情态动词最好不要随随便便去掉吧？
选C的麻烦给理由吧～作者: pangpangshin 时间: 2011-3-25 07:00
选c因为and平行的内容是biological life forms ever emerged on Mars 没有can
后面加了can以后逻辑不对
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