问题补充：
I was surprised by her words,which made me recognize silly mistakes I had made.
A. what
B. that
C. how
D. which
答案：
(答案→)A. what
B. that
C. how
D. which
解析：此题考查动词后面接宾语从句的用法。在recognize后面的宾语从句中缺少修饰silly mistakes的定语，所以先排除C项和B项，因为how不能作定语，that连接宾语从句时不作句子成分；再加上这里没有选择关系，排除which。
