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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
考点split的做题方法：
考点1/平行：whether A and whether B.
1.1 结构平行，排除de
1.2 时态平行，emerged ---- left 排除a
考点2/句子结构： ,***, 跳过逗号文字，b: whether can those traces ... whether 和 can意思重复，要去掉can或者whether中任意一个。b排除。另外c中 whether,if...这样也是同一个意思，不简洁。
考点2/句子结构：
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