[求助]GWD2-33

在讨论汇总贴里面没有发现第二套题的讨论,很是郁闷,所以贴一道题,麻烦大家帮帮忙^_^

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.

答案是A,我选的是B,虽然我觉得这道题每个选项都有点问题,但是在A里面,EACH OF WHICH是属于独立主格情况吧,难道它后面是跟复数而不是跟单数?迷惑了...请大侠指教

顶下， 这题有点奇怪， 高手来看