TT-GWD 2-34

Q6 :TT-GWD 2-34.

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

答案是C 没问题。临近考试再看一遍SC，居然问题重重……

我的问题是presuming后面跟的是不是一个句子啊……我好像记得presuming后面是可以直接跟从句的，表假设