【英语】第20题解析！！）

这个题有两个语法知识点。
一、关系代词引导的定语从句的谓语动词，当关系代词作主语时，谓语动词的人称、数与先行词一致，如：
Tom is one of the boys who are fond of American English.
I know a boy who is very good at surfing the Internet.
Parents don't like children who tell lies.
这里的关系代词指代teachers，在定语从句中作主语，谓语动词要用复数形式。
二，as well as连接两个句子成分时，侧重在前者，意思是“和”或“不仅……而且”，因为它侧重在前者，所以它连接两个主语，谓语动词就以前者为准，如：
He as well as I is wrong.
German as well as English is spoken in this region.
I learn Spanish, French, German, Japanese as well as English.
希望我能帮助你解疑释惑。

20，who 关系代词，引起定语从句。它指代teachers ，在定语从句中作主语，谓语动词应该用复数谓语are。

前一空是who引导定语从句修饰teachers，所以用复数的are
后一空是主句的谓语，主语是every student as well as teachers,所以用单数的is
注：A as well as B做主语时，谓语动词与A保持一致，即就远原则。

大体意思是说每一个学生和参观博物馆的老师一样，被要求准时到达校门口。teachers后面是一个定语从句，who代指老师，什么样的老师，去参观博物馆的老师，所以用复数are，把中间的定语从句忽略，句子主体是every student is asked to be ,,,,,,,一目了然，用第三人称单数is

Aswellas就近一致