题目内容
Do you have any idea ________ is actually going on in the classroom?
[ ]
A.that
B.what
C.as
D.which
答案:B
解析:
解析:
what引导同位语从句且在从句中作主语.that引导名词性从句时不能充当任何句子成分.which引导名词性从句意为“哪一个”.as不用来引导名词性从句.
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