1.He is one of the boys who always _do_ well at school.

1.主语是he,所以用单数
2.has 主语是He，所以用has。跟us无关
3.either or用单数
4.one 用单数，它只是其中一个，跟第一题类
5.as well as指和，用复数
这些题的秘诀就是判断谁是主语，还有背熟一些短语如as well as、either or 等的用法

1.He is one of the boys who always _do_ well at school.这是定语从句，先行词是boys，所以用复数。
2.He is the only one of us who _has_ passed the exam.这同样是定语从句，先行词us被 the only所修饰，所以用单数。

3.Either you or one of your syudents _is_ to attend the meeting.这是就近原则的题型，one of应看作单数。
4.At present ,one of the arguments in favor of the new airport _is_ that it will bring a lot of jobs to the area.one of应看作单数。
5.Every student as well as teachers who are to visit the museum _is_ asked to be at the cshool gate on time.主语是Every student 看作单数。