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题库 / GMATLA-SC-9
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.
and whether, presuming such life forms having left fossil traces to begin with, those traces can
and whether, if it is presumed that such life forms left some fossil traces to begin with, can those traces
and whether, presuming such life forms left fossil traces to begin with, those traces
and, presuming such life forms did leave some fossil traces to begin with, if they can
and, presuming such life forms to have left fossil traces to begin with, if they
DE不平行，先排除，B whether后用了倒装，排除，A presuming后核心词是life forms，having left fossil traces修饰life forms，但是原句要表达的意思是假设这种生命的形式留下迹象，而不是表达假设这种生命形式，排除。C完全正确
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