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.
C, and whether ,presuming such life forms left fossil traces to begin with , those traces 插入语中的left用的比较诡异, such后面应该是加名词结构, 这个left的定后表示被动, 但是感觉主动才是正确的; 另外can的省略也不对;
A的确长得也很丑, having left应该是想表达that have left的意思. 逻辑上面还算好. 但是就像薰衣紫草说的, 逻辑主语是硬伤.