关于行业生命周期的论述，正确的有（）。

A.处于衰退期的行业可能也有机会重新进入较高增长的阶段

B.行业的衰退期往往比其他三个阶段的总和还要长

C.行业生命周期四个阶段的分析适用于所有的行业

D.行业注定都要走完一个完整的生命周期，直至衰亡

---- Look! Everything here is under construction.

---- Oh, has the building once ___ for exhibition been pulled down, too?

A．having been built

B．being built

C．to be built

D．built