what made her parents so happy?-__she had failed in the examination.A.as,B.that.C.because, D.since请说明理由

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what made her parents so happy?-__she had failed in the examination.A.as,B.that.C.because, D.since请说明理由

what made her parents so happy?-__she had failed in the examination.A.as,B.that.C.because, D.since请说明理由
what made her parents so happy?
-__she had failed in the examination.
A.as,B.that.C.because, D.since
请说明理由

what made her parents so happy?-__she had failed in the examination.A.as,B.that.C.because, D.since请说明理由
B
That she had failed in the examination made her parents so happy.
that引导的主语从句

B,以what 提问,回答必须是名词,that引导主语丛句

B。
这里回答的是作为问句的主语,也就是“what”的部分。
其实是一个主语从句。
其他的词都是表示原因状语的