问题补充：
Our school is no longer is was 10 years ago, it was not well equipped.
A. what; which
B. that; which
C. what; when
D. that; where
答案：
A. what; which
B. that; which
(答案→)C. what; when
D. that; where
解析：表语从句中应用what 引导，充当从句的主语，关系副词when在引导的非限制性定语从句中作状语，修饰先行词10 years ago。故选C。
