---He seems to be a teacher.---. He has been a teacher for 20 years.A. So he doesB. So he

问题补充：

---He seems to be a teacher.

---. He has been a teacher for 20 years.

A. So he does

B. So he is

C. So does he

D. So is he

答案：

A. So he does

(答案→)B. So he is

C. So does he

D. So is he

解析：考察so的固定句式。so的几个特殊结构有：“So+助动词/情态动词/be动词+另外一主语”表示前面的肯定情况适用于另外一个人。“neither/noe+助动词/情态动词/be动词+另外一主语” 表示前面的否定情况适用于另外一个人。“So+同一主语+助动词/情态动词/be动词”表示前面的情况属实。本题表示的是前面的情况属实，因为前面有系动词be，故B项正确。句意：—他似乎是一个老师。—的确如此。他已经做了的老师了。故B正确。