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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
B. whether ......can those traces语序错误
C. 正确
2.是those traces是否存在，而不是是否"能"存在，不需要用can
2.是those traces是否存在，而不是是否"能"存在，不需要用can
#whether those traces still exist in some moist recesses of the cold and arid planet.#
A：approach has not answered 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 plane.】
having left❌
can 重复
1.平行
2.主谓
A：多了一个动词can
B：多了一个动词can，redundant
D：and前后句式不平行
E：and前后句式不平行
且presuming(that), 表示假设、如果……，【用法类似if，后面跟从句，无需逻辑主语】，排除DE；
B中can those与前面句式不平行，排除；题目在乎的是those traces是否存在，而不是是否"能"存在，因此弃用can
presuming(that), 表示假设某事发生，如果……，用法类似if，后面跟从句。它不是伴随状语，是个从属连词，跟的是句子，presuming本身没有逻辑主语。
同样用法的还包括providing (that)，provided (that)， assuming (that)
A错在having：
presuming(that), 表示假设某事发生，如果……，用法类似if，后面跟从句。它不是伴随状语，是个从属连词，跟的是句子，presuming本身没有逻辑主语。
同样用法的还包括providing (that)，provided (that)， assuming (that)
presuming(that), 表示假设某事发生，如果……，用法类似if，后面跟从句。它不是伴随状语，是个从属连词，跟的是句子，presuming本身没有逻辑主语。
同样用法的还包括providing (that)，provided (that)， assuming (that)
can有歧义，因为大家在乎的是这些trace是否还exist而不是can exist
根据语意，应该是这些traces是否依然存在着，而不是依然有能力存在着。因此can是赘余的
Whether的存在就已经在表示这些痕迹能否存在
这里的can并没有缩小范围，所以赘余