问题补充：
My English teacher gave us a suggestion yesterday, is often the case, our monitor organize a debate after class.
A. which, which
B. which, that
C. as, that
D. as, which
答案：
A. which, which
B. which, that
(答案→)C. as, that
D. as, which
解析：考查固定搭配和同位语从句。固定词组As is often the case这是常有的事；第二空的that引导同位语从句，对名词suggest的内容进行解释，名词suggestion后面的同位语从句要使用should+动词原形的虚拟语气，should可以省略。That在同位语从句中不充当任何成分，只起引导作用。故C正确。
