英语语法问题？

Question

第二题为什么会选A呀

Answer 1

这道题考察的是have sb do sth（“使某人做某事”）的用法以及定语从句。
分开两个句子为：
Your father had the man repair the computer. The man was Mr. Smith.
合并为定语从句：
The man （that/who/whom your father had repair the computer）was Mr. Smith.
引导词在从句中作had的宾语，省略。
故选A。