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

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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。