I was surprised by her words, which made me recognize silly mistakes I had made.
A. what
B. that
C. how
D. which
网友回答
(答案→)A. what
B. that
C. how
D. which
解析：主要测试宾语从句。题干中需要引导宾语从句的引导词，还需要修饰限定名词短语silly mistakes的限定词，综合得知what最佳。意思：我对让我意识到我犯了多么愚蠢错误的话语非常吃惊。