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.

A、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.
B、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.
C、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.
D、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.
E、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：E

专业教师答疑

问题：我上来先看的是单复数，ac用的are be ready应该是单数，然后就选了d

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问题：请问b选项的which are each 有错吗？此处are 的主语应是which不是each吧查看答疑

问题：Each 后面一定是接单数吗？查看答疑

问题：错选了B，我读完题觉得语义强调的是在任何时候鲨鱼的牙齿掉了，就有新的补上。排除A是因为 each of which后面是is，排除C、E因为each one of which多余；E我也留下来了，但是觉得语义更想说明这个whenever，于是我想whenever先说会比较好，于是就选了B。查看答疑

问题：A 哪里不对么查看答疑

问题：E选项each one 不是该redies吗？单数？查看答疑

问题：A中的each of which are对吗？还是应该用is？ C中的each one of which这种表达我感觉不可以。但说不出来哪里错误了，请老师点明一下... 查看答疑

问题：为什么D选项不行？感觉D的意思也是可以的啊查看答疑

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