TTGWD－2－34

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.

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:

答案是A，不太明白，为什么不选C

C is wrong b/c there are two complete sentences after presuming.

呵呵在上面第一次回复帖子就献给你了!

以前似乎看见过你的复习计划,写的非常详尽

不过C肯定是错误的,因为C中去掉了重要的关键情态动词CAN

情态动词不能轻易去掉

我比较支持C 虽然 那个情态动词我觉得最好不要去掉 A中对我来说最突出的错误在于 presuming引导一个句子 功能相当if 这样就缺少谓语动词

知道了，CAN的位置错了。不知道中间插入的IF句有没有问题