-----she was invited to the ball made her very happy A.what

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-----she was invited to the ball made her very happy A.what B.that C.when D.because
为什么选B不选A啊、、求解释

主语从句中that只起引导词作用,不做成分也没有意义she was invited to the ball 成分意义均完整.
而what一般在从句中做主要成分（主语,宾语等）,且有意义（可根据句意灵活翻译）,如：
1.That he came late again made the teacher angry.
2.What he said in class made the teacher angry

-----she was invited to the ball made her very happy A.what 1、（）she was invited to the ball made her very happy . 单项选择 they ______ her to the party,so she was very happy A in ____she was invited to the conference made her quite excited She was very happy.She made few____(mistake) in the maths te That she was able to come made us very happy为什么要加个that 填词完整her teacher was very unhappy because she made such a s__ Their teacher was very happy to see that this match made the he was ----her work.she was happy.a.kind to b.pleased with I was very happy to invite him to my home对吗?为什么不用invited? She wrote a poem when she made a tour to what was once a bat Look a Linda.She/Her/she's very happy.