what should i get my grandma for her birthday 、 -why __you ___a scarf A not buy B don't buy C don't to buy D not buy

what should i get my grandma for her birthday 、 -why __you ___a scarf A not buy B don't buy C don't to buy D not buy
what should i get my grandma for her birthday 、 -why __you ___a scarf
A not buy B don't buy C don't to buy D not buy

what should i get my grandma for her birthday 、 -why __you ___a scarf A not buy B don't buy C don't to buy D not buy
B don't buy
why not...后面没有主语,直接跟动词原形,排除A、D.
助动词do/does/did以及其否定结构的后面接动词原形,排除C.

选择B Why don't you buy=Why not buy为什么不……呢

B why not=why don't you 用于给对方建议，建议对方一些什么，所以答案是B

B。
Why don't you buy a scarf ? 为什么不买个围巾呢？
选项A的用法是：Why not buy a scarf ?
其实这句话是表示向对方征求意见或提出建议的，与此类似的还有：
What about buying a scarf ?
Let's buy a scaf, shall we ?
Shall we buy a scarf ?

你好：
“为什么不怎么做”有两种用法：
why don't you do 或者 why not do ?
所以据此选择答案B。
希望能帮到你，望采纳，谢谢。

你好！
选择B。
应为“为什么不这么做”有两种用法：
why don't you do 或者 why not do ?

有疑问请追问，
祝你学习顺利！

B 因为本句有两种语法 1.Why not do something? 2.Why don't somebody do something?
而本句中含有人也就是you，所以是选B

答案选B
Why don't you do sth = Why not do sth 为什么不……呢?

选择B，因为why don't you do固定搭配，后面加动词原型~~如果是why not 后面直接跟动词原型，没有you这个单词。