When I called you this morning, nobody answered the phone,          ?

A．where were you

B．where did you go

C．where have you been

D．where have you gone

房地产市场周期阶段中，高峰期的主要特征有（）。

A．售价以比租金快得多的速度上涨

B．新房换手快，交易量大

C．大批房地产开发项目开工

D．房屋空置率也经历了在上升期的基础上继续上升到该阶段后期开始下降的过程

E．新房销售困难