-----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
问题描述：
-----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
答
选择B
答
这是that引导的主语从句，在复合句中充当主语成分的句子叫做主语从句.引导主语从句连词有that,whether,who,what,whatever等
What 引导主语从句时在从句中充当句子成分，如主语．宾语．表语，而that 则不然。例如：
What you said yesterday is right.
答
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