My mother doesn’t know this morning.
A. what to do
B. what does do
C. how to do
D. why does do
网友回答
(答案→)A. what to do
B. what does do
C. how to do
D. why does do
解析：“疑问词 + 动词不定式”是英语中常用的一种结构。在句中可以作主语、动词或介词的宾语以及表语。本句的含义是我妈妈不知道今天早晨该做什么，其中what to do做know的宾语。C项是错误的，正确的表示是how to do it。故选A。