以下是引用GMATCRACKER1983在2005-6-23 0:22:00的发言: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 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 答案是A.可是我怎么也想不通 为什么用presuming such life forms having left fossil traces to begin with .PRESUME 的逻辑主语是谁?还有为什么用HAVING ?谢谢. 希望得到NN门的答案~!
我觉得用having left的完成时态很好啊!表明的是一种状态的延续,从过去一直到现在,也正是因为从过去一直延续到现在,所以后面的动词才用can啊。
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