请教GWD2-Q34,很困惑

zhangluE

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
  Answer:
我最初选的是C，但答案是a
查了XDF的一个分析说是B，因为A、C的presuming 都没有逻辑主语，似乎也很对
请NN出现解答一下吧

nishiyao

如果选B的话  WHETHER后面的CAN不就成了倒装结构了么  我也疑惑了

zhangluE

倒装结构是没问题的，不算错，而且是正确答案的标志吧

wangliming

我也比较偏向C，C和A好纠结啊。

B不对吧 = = ，中间部分做插入语，是approach presume吗？B还加了一个some，和后面的some有点重复的感觉。

NN快点出现吧

nishiyao

我觉得倒装结构不能说看到就觉得对  whether后面 在没有其他特殊语境的条件下 应该不能倒装
C的问题在于去掉了情态动词CAN   句子里面如果情态动词没错的话就不应该去掉

zhangluE

如果C错了，A和B呢？
XDF的分析说为A、C的presuming 都没有逻辑主语，不知道大家怎么看

chriswendy35

同困惑,我看到答案给的是C

很纠结A和C的选项,因为C里面没有can,削弱了语气
A里面having left看的又很别扭

搜索答案居然看到XDF说B
到底选什么呢

希望NN出现巴