Do you have any ideas is actually going on in the classroom? A. thatB. whatC. asD. Which

问题补充：

Do you have any ideas is actually going on in the classroom?

A. that

B. what

C. as

D. Which

答案：

A. that

(答案→)B. what

C. as

D. Which

解析：主要测试同位语从句。有句子语境可以晓得句子意思为：你知道教室里实际在发生什么事吗？另外所选答案还要充当双重作用：引导句子还要做从句的主语。故此答案一目了然。