A．(A) Because they had driven for a long time.

B．(B) Because they had booked for another time.

C．(C) Because they had planned to have their supper first.

D．(D) Because they had found a better place to stay in.

空调控制器根据温度设定点和室内温度的不同会采取不同的工作模式，如客室内温度设定点是23℃，当室内温度高于25℃时，机组将按（）工作。

A.半冷工况

B.全冷工况

C.通风工况

D.停机