Question

The policeman caught the thief ________ has stolen Mr．Li’s computer．

1. A.
   which
2. B.
   whose
3. C.
   whom
4. D.
   who

Answer 1

D
考查定语从句的引导词，which用于指事儿；whose“谁的”；whom“谁”是宾格；who“谁”，是主格，先行词指人，关系代词在从句中作主语，所以要用主作格。