关于名词的英语题哦,不难A wife and ___have set an excellent example of living together in harmony A a husband B husband C her husband D the husband 答案为B,为什么不是A?

关于名词的英语题哦,不难A wife and ___have set an excellent example of living together in harmony A a husband B husband C her husband D the husband 答案为B,为什么不是A?
关于名词的英语题哦,不难
A wife and ___have set an excellent example of living together in harmony
A a husband B husband C her husband D the husband
答案为B,为什么不是A?

关于名词的英语题哦,不难A wife and ___have set an excellent example of living together in harmony A a husband B husband C her husband D the husband 答案为B,为什么不是A?
这样的用法以前学过的,
a wife and husband 是“一对夫妻”
a wife and a husband 是“一个妻子和一个丈夫”
这两个是不同的
例如：a expert and teacher是“这个人既是专家有是教师”而 a expert and a teacher 是“一个专家和一个教师,是两个人”

wife and husband是词组，意：夫妻

这是固定词组啊
a wife and husband
表示一对夫妇

一对夫妻，当成整体了