题目信息
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
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C:and whether, presuming such life forms left fossil traces to begin with, those traces
NASA’s methodical approach has not yet answered the questions of whether and whether...排除DE 选项A having left时态错误 选项B IF it is 多余； whether 残those 和前面的whether biological life forms ever emerged on Mars 不平行 选项C正确
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