下列关于大气污染源调查的叙述错误的是( )。

A．大气污染源有固定污染源和移动污染源两类，当前大部分的大气污染源调查主要考虑固定污染源

B．对于一个三级评价项目不一定要调查民用污染源

C．如果建设项目将会替代原有的污染源，则无需再对替代的污染源进行调查

D．若评价区域内有在建、拟建项目，则对其污染源也需进行调查

Great changes have taken place in that college. It’s no longer _____ it was 20 years

ago, _____ it was so poorly equipped.

A．what; when

B．that; which

C．what; which

D．when; that