Do you have any idea is actually going on in the classroom?A. thatB. 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：本题考查同位语从句的用法。这句话中缺少从句的主语，that引导同位语从句时，只起连接作用，不作句子成分，所以先排除that；根据语境意义，这里不知道发生了什么事，故排除as和which。