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标题: GWD（31） 2-34 [打印本页]

作者: greentree_du 时间: 2006-9-19 12:19
标题: GWD（31） 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.

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

给的答案是A，我选C。求教！谢谢

作者: carolhide 时间: 2006-9-20 17:52

情态动词不能随意删去。

作者: chamcham 时间: 2007-6-26 15:30

以下是引用carolhide在2006-9-20 17:52:00的发言：

情态动词不能随意删去。

cool, that is typical NN's explanation, precise and clear

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