[讨论]GWD31的33题答案是否有问题？

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.

   Answer:A

http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=219592&page=1

晕，到底哪一个是正确的？

E is correct, sorry I typed it as A.

A is definitely wrong forthe following reason:

1)are should be is

2)the logical meaning is bad.