求教，这道题的答案

jadezhangweiyu

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.

晓幻

全划线的句子尤其要注意句子的逻辑~大部分都是这样的
一开始读句子，当一个active tooth怎么样了，many spare teeth在那里怎么样，每一个准备掉进那个位置里边。感觉有些不通顺，因为按照正常逻辑，当active tooth怎么样了，应该要直接说出那些spare teeth会掉进那个位置里边，而A中间加了东西，句法逻辑有问题，不通啊，干掉
B 也是相同的问题，干掉
C,D,E都还好，再仔细读一下，发现D没有谓语，先干掉
最后比较C和E，读到后面发现，C中谓语是are，可是前面是each什么的，主谓不协调干掉。而且读起来也比E更加wordy
而E里边, each one ready后边是补充修饰，所以没什么问题……

zwgxyi

this should be (e).

the other four choices all misuse "which" (or "each of which", whose modifier properties are the same as those of "which").
in (a), "each of which" doesn't refer to anything at all (it seems to refer to "reserve", but that doesn't make any sense)
in (b), "which" refers to the shark's jaws (this doesn't make sense)
in (c) and (d), "each one of which" refers to the shark's jaws (this doesn't make sense)

also:
(a) and (b) have the wrong meaning: the placement of the "when"/"whenever" clause suggests that the teeth are only there when another tooth is lost or worn down.
(c) has subject-verb disagreement ("each one of which" is singular, but "are" is plural).
(d) is a sentence fragment.

jadezhangweiyu

感谢感谢！

jadezhangweiyu

谢啦