_______ the final of UEFA Champions League (欧冠) between Manchester United and FC Barcelona, I would not have stayed up after midnight.

A．Were there not

B．Were not there

C．Had there not been

D．Had not there been

下列火灾自动报警系统中，功能最复杂的是（）。

A.区域报警系统

B.集中报警系统

C.控制中心报警系统

D.区域或集中报警系统