My mother’s birthday is coming I don’t know for herA. what to buyB. how to wearC. when t

问题补充：

My mother’s birthday is coming, I don’t know for her．

A. what to buy

B. how to wear

C. when to go

D. why to do

答案：

(答案→)A. what to buy

B. how to wear

C. when to go

D. why to do

解析：句意：我妈妈的生日就要到了。我不知道为她买什么。结合句意可知不知道买什么，故选A。