问题
选择题
Great changes have taken place in that school. It is no longer _______ it was 20 years ago, _______ it was so poorly equipped.
A．what; when
B．that; which
C．what; which
D．which; that
答案
A
第一空是what引导的名词性从句作表语,第二空是when引导的定语从句。