GWD2-Q34

xyredpoppy

GWD2-Q34:

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.

 

1. and whether, presuming such life forms having left fossil traces to begin with, those traces can

2. and whether, if it is presumed that such life forms left some fossil traces to begin with, can those traces

3. and whether, presuming such life forms left fossil traces to begin with, those traces

4. and, presuming such life forms did leave some fossil traces to begin with, if they can

5. and, presuming such life forms to have left fossil traces to begin with, if they

   Answer: A

时态完全搞不清除了，为什么A用 having left fossil traces ？

ljc0729

个人偏向C，觉得A的HAVING LEFT 有问题

xyredpoppy

大家来看一下？难道我答案错了？

dreamroad

答案是C