Question

He________for eight hours when I arrived there．

1. A.
   works
2. B.
   worked
3. C.
   has worked
4. D.
   had worked

Answer 1

D
分析：本题有when I anived there时间状语从句，因此work的动作是在arrived发生之前延续了八个小时，所以要用过去完成时。