KFC 求教each of which谓语动词跟什么?

JJ.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.

A 是给的答案.

可是, each of which are ready to slide into the appropriate position-----这里怎么能用are 呢?

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Taste buds are onion-shaped structures with between 50 and 100 taste cells, each of them has fingerlike projections poking through the opening located at the top of the taste bud called the taste pore.

(A) them has fingerlike projections poking through the opening located at the top of the taste bud called the taste pore

(B) them that have fingerlike projections that poke through an opening located at the top of the taste bud, which they call the taste pore

(C) which has fingerlike projections poking through the opening, called the taste pore, located at the top of the taste bud

(D) which having fingerlike projections that poke through an opening, which is called the taste pore, located at the top of the taste bud

(E) which have fingerlike projections that are poking through an opening located at the top of the taste bud called the taste pore

PREP 中139 题,

用的是each of which has

这是怎么回事? 到底, each of which谓语动词跟什么? 

同问！each of which + V 单数！这不是很多语法笔记里面都有的吗？！

看来看去，好像只有E才对，虽然也不是很好。

肯定是E啊. A的逻辑意思就不对,难道是:牙齿掉了,备用的牙齿才LIE再JAW里面的?

对啊, 逻辑意思,...

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谢谢tony 提醒, 这里只有E了, 虽然, 有人说, each one, 不好.

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这是在谁整理的KFC啊？我怎么没找到？---- 这是从某人这月KFC来的, 我忘了是谁, 刚开始他只是回忆,没找到原题, 后来贴上来了,

还有，是出自GWD的题吗？---- 这是TT GWD 2-33