Do you have any idea is actually going on in the classroom?A. that B. whatC. asD. which

问题补充：

Do you have any idea 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：考查同位语从句。同位语从句What is actually going on in the classroom解释名词idea的内容，what在句中做主语。