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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
GMAC认为在宾语从句中用if有歧义，比如 i do not know if he has finished the job，可以理解成：我不知道他是否完成了工作，还可以理解成： 如果他完成了工作，我就不知道。所以在宾语从句中表假设，尤其是GMAT考试中，用whether。
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