Question

Tian'anmen Building is the place ________ Chairman Mao Zedong announced that our P. R. C. was founded.

1. A.
   where
2. B.
   in which
3. C.
   that
4. D.
   which

Answer 1

A
该句定语从句的先行词为地点，并且根据句意分析，从句中需要地点状语，表示毛泽东主席“在天安门城楼上”宣告中华人民共和国成立了，所以引导词应用关系副词where或on which。