问题补充：
The poor little girl was young to know when her parents suddenly died in an accident.
A. so; what to do
B. too; what to do
C. so; how to do
D. too; how to do
答案：
A. so; what to do
(答案→)B. too; what to do
C. so; how to do
D. too; how to do
解析：too+ adj to do，表示太…，而不能做某事，故选B
