区分定语从句和同位语从句

区分定语从句和同位语从句
I can think many situations -------students know many English words but can`t write a good article.
A,where B,when C ,that D,\
若是A就是定语从句,situations就做先行词,这是对的.但为什么C不可以呢?可不可以把后面的从句作为situations的同位语,用that引导同位语从句呢?（我认为,后面的从句也可以是在阐述situations,表达同位语）

I can think OF many situations -------students know many English words but can`t write a good article. ----------你漏了of
答案是 A / B 或者是 in which.

1 这道题出得不好,因为 situation 根据牛津高级英汉字典(第七版)page 1877 的定义,指地点,也指时间.There is no reason to say that WHERE is right and WHEN is wrong, and vice versa. 最好的办法就是出题人避免同时出现where 和when供学生选择.

2 肯定不能做同位语处理,因为 where / when == in those situations
再问： 能把2说详细一点吗？为什么不能做同位语处理？
再答： I can think OF many situations WHERE / WHEN / IN WHICH students know many English words but can`t write a good article == I can think OF many situations , and IN THOSE SITUATIONS students know many English words but can`t write a good article. --------只能做状语的成分。
再问： 这个与我说的that引导的同位语从句有什么关系啊？
再答： 就是说，这道题肯定不能选择that. that除了是同位语的引导词，它还能是什么成分？首先你必须确认that在句子里面的成分。告诉我你选that的道理。我崇拜道理。
再问： 不是说that引导同位语从句，不用在从句中作成分吗？ I can think of many situations [that students know many English words but can`t write a good article.]后面的从句做situations的同位语啊，就是阐述situations的内容啊。
再答： 就是说，这道题肯定不能选择that. that除了是同位语的引导词，它还能是什么成分？首先你必须确认that在句子里面的成分。告诉我你选that的道理。我崇拜道理。 换句话说，如果你能去掉in, 我就认为它是同位语从句。你能吗，去掉in 后，situations在从句部分是什么成分？ 你可以用替换发来理 1 I can think many OCCASIONS on which / when / where students know many English words but can`t write a good article 2 I can think many TIMES WHEN / MANY SCHOOLS WHERE students know many English words but can`t write a good article 总而言之，做同位语是不行的。jizhu: I can think of many situations / instaces / examples IN WHICH students know many English words but can`t write a good article. ZUIHOU,我必须说，你的意思我完全理解，也完全同意，但习惯用法是first things first .这一点，你不能忽视，否则就被认为是另类了。
再问： 你的意思是不是按定语从句还原：students know many English words but can`t write a good article in those situations。 situations只能做这个句子的状语，但不能做这个句子的同位语？
再答： ok 你终于通了。
再问： 谢谢你这么有耐心的回答我的问题！
再答： welcome, friend .