高中英语，请问这道题为何选both？both不是不能用于否定句吗？

Question

[290] It’s an either-or situation -- we can buy a new car this year or we can go on holiday but we can’t do ____.
A. others B. either C. another D. both
网上的搜了一下，貌似大多是both。。
可是觉得both不用于否定句啊。（不会是我把too的用法代入了吧？）

Answer 1

both虽然有不用于否定句的说法，但是也要看具体语境的。

both用法
1）adj.两者
一般单独修饰名词（复数）做前置定语（但名词前不能有其他限定词修饰）,不做表语/补足语.
如：There are many flowers on both sides of the street.
2）pron.两者
可以单独使用（相当于名词）,也可以构成“both of + 其他限定词 + 名词（复数）”或“both of + 代词”结构.
Both are my good friends.
Both of the boys over there are my good friends.
Both of them are my good friends.
3）adv.两者都
一般放在句中,即be动词之后/前均可,助动词/情态动词/行为动词之前.
They are both my classmates.
They both can play soccer well.
They both have a good son.
4）conj.不仅...而且...；...和...都...
一般构成both...and...结构,用于连接句中任意两个并列部分.
如果并列两个主语,谓语动词一般采用复数形式.
如：Both you and I are students.
I can speak both English and Chinese.
They can both sing and dance.
The boy is so lazy that he sleeps both in the daytime and at night.

Answer 2

这个从意思上很好理解
要么买车，要么旅游，但是不能两样都做
A其他的 意思不对，排除
B任一的 意思不对，排除
C另一个 意思不对，排除
D两个都做 意思吻合
both虽然有不用于否定句的说法，但是也要看具体语境的。本回答被提问者和网友采纳

Answer 3

both这里是当副词讲的吧

Answer 4

在物理吧开英语贴，请左转到高中英语吧

Answer 5

出门左转英语吧