PREP39

39. 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 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

答案C没问题，请教在A中不考虑其它错误下，EACH OF THEM的THEM是否有指代问题？是不是EACH OF WHICH因为从句就近修饰而解决了指代问题？

想請教NN，C答案中的called和located中間為什麼不用and連接呢? 兩個分詞並列不是需要連接詞連接嗎?

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

called the taste pore是插入成分，不影响句子整体结构，所以不存在你说的问题

另外关于A和C的区别，同意LS的意见

这里A选项的them是否有指代不清的问题？谁能回答一下！

不同意called the taste pore是插入成分，因为后面是located这儿描述的是一般现在的情况，不可能用过去时。

想了一下还是有疑惑，请NN指教，located到底是什么成分？

located不应该用过去分词（which is located），应该用现在分词，locating就应该可以了。