Question

A new college is being built in ________ I can remember was an old factory 20 years ago．

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

Answer 1

D
考查宾语从句，介词in后面接的是宾语从句，宾语从句中缺少主语，I can remember是插入语，what可以做宾语从句的主宾表，句意是：一所新大学正在我记得20年前是个旧工厂的地方被建。选D。