today,we'll discuss a number of case （ ）beginners of English fail to use the language properly.A which B as C why D where这句话怎么翻译,为什么选where?

today,we'll discuss a number of case （ ）beginners of English fail to use the language properly.A which B as C why D where这句话怎么翻译,为什么选where?
today,we'll discuss a number of case （ ）beginners of English fail to use the language properly.
A which B as C why D where
这句话怎么翻译,为什么选where?

today,we'll discuss a number of case （ ）beginners of English fail to use the language properly.A which B as C why D where这句话怎么翻译,为什么选where?
今天,我们要讨论一些英语初学者经常不能正确运用的例子.
where引导一个定语从句,case是先行词.

排除法

今天我们要讨论一系列英语初学者常常误用的问题。

名词性从句