问题补充：
It is my favorite book which is about ．
A. how did Alice find her lost parents
B. what did Alice find her lost parents
C. how Alice found her lost parents
D. what Alice found her lost parents
答案：
A. how did Alice find her lost parents
B. what did Alice find her lost parents
(答案→)C. how Alice found her lost parents
D. what Alice found her lost parents
解析：英语宾语从句中一般为陈述语序。How引导宾语从句表示方式方法，做状语。What引导宾语从句充当主语，宾语，表语。句意：我最喜欢的书是关于爱丽丝如何找到他失散的父母的。结合语境可知从句缺少方式状语，故选C。
