-Did Peter fix the computer himself? ---He because he doesn’t know much about computer

问题补充：

---Did Peter fix the computer himself?

---He, because he doesn’t know much about computers.

A. has it fixed

B. had fixed it

C. had it fixed

D. fixed it

答案：

A. has it fixed

B. had fixed it

(答案→)C. had it fixed

D. fixed it

解析：考查固定结构。Have sth done使某事被做；句意：—Peter自己修好电脑了吗？—他让别人修的，他不了解计算机。故C正确。