I was surprised by what she says．which made me recognise ________ silly mistakes I had made．I was surprised by what she says．which made me recognise ________ silly mistakes I had made． A．what B．that C．how D．which 为什么不选C?C也读得通啊···

I was surprised by what she says．which made me realise ____what____ silly mistakes I had made
语法结构：what (a / an) + 形容词+ 名词 +主语+谓语(+其它成分)！
They are silly mistakes indeed ------- What silly mistakes they are indeed!
注意：应该吧 recognise 变成realise. 出题人累了：
recognise -----用于视觉方面
realise.------用于心理感觉方面

A稍通顺一些；C语法上也是对的。
出题人出得不好

A 感叹句的结构，what +名词短语+主语+谓语！这里 silly mistakes 属于名词短语，所以是what

recognise how silly the mistakes i had made are

A 感叹句的结构,what +名词短语+主语+谓语!这里 silly mistakes 属于名词短语,所以是what .