题干
Great changes have taken place in that school. It is no longer ___ it was 20 years ago, ___ it was so poorly equipped.
A：what, whe
B：that, which
C：what, which
D：which, that
答案(点此获取答案解析）
A
技术的不断进步，研究物质的手段和途径越来越多，N
、H3、O4、C60等已被发现。下列有关说法中，正确的是 （ ）
