求大牛指点！谢谢！！！！！

kathyontheway

求牛人指点！GWD2里面的两道语法我实在不太懂为什么。。。也不知道该去看哪个书，我看了MANHATAN可上面好像没有细讲插入语的使用到底是完整句还是非完整句！  求大流们指点一下或者告诉我该去哪看什么资料。。。。。


Q33:
When an active tooth in the shark’s jaws is lost or worn down, many spare teeth lie in seemingly limitless reserve, each of which are ready to slide into the appropriate position.

1. When an active tooth in the shark’s jaws is lost or worn down, many spare teeth lie in seemingly limitless reserve, each of which are ready to slide into the appropriate position.
   
2. Whenever an active tooth is lost or worn down, many spare teeth lie in seemingly limitless reserve in the shark’s jaws, which are each ready to slide into the appropriate position.
   
3. Many spare teeth lie in seemingly limitless reserve in the shark’s jaws, each one of which are ready to slide into the appropriate position when an active tooth is lost or worn down.
   
4. The many spare teeth lying in seemingly limitless reserve in the shark’s jaws, each one of which is ready to slide into the appropriate position whenever an active tooth is lost or worn down.
   
5. In the shark’s jaws, many spare teeth lie in seemingly limitless reserve, each one ready to slide into the appropriate position whenever an active tooth is lost or worn down.
   
   为什么A项“each of which are ”要用are呢？不是each 开头的么？？？？
   
   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 wit
      
      插入语“ presuming such life forms having left fossil traces to begin with,”，为什么要用“having left呢？我选的是C。。。。C哪里错了。。。。
      
      
      
      谢谢大牛们！！！
      
   
   
   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 wit
      
      插入语“ presuming such life forms having left fossil traces to begin with,”，为什么要用“having left呢？我选的是C。。。。C哪里错了。。。。
      
      
      
      谢谢大牛们！！！
      

sally9031

你这答案哪来的？？？~错了吧~
第一题应该选E，each of which后面当然不接are~得按照句子逻辑选~当有牙齿掉了或损伤了，其他牙齿移动过来，有点补救的意思~所以那个whenever···要跟在其他牙齿移动的后面~
第二题是选C。