I can think of many cases ______students obviously
I can think of many cases ______students obviously knew a lot of English words and expressions but couldn't write a good essay . A.why.B.which.C.whose.D.where
答案是WHERE 把你的句子分成两句就简单了: 1 I can think of many cases. 2 In those cases students knew a lot of English words and expressions but couldn't write a good essay . 再把 2 裏面的 In those cases 换成where或者in which.再合并起来就OK了.
恕我直言,你的这四个答案都是错的,唯一正确的答案是:that; that students obviously knew a lot of English words and expressions but couldn't write a good essay. 是cases 的同位语从句,这里引导词只能用that。