Tom took a taxi to the airport, only _______ his plane high up in the sky.

A．finding

B．to find

C．being found

D．to have found

水泥行业主要节电技术：（）

A．生产规模大型化

B．生料设备采用球磨技术

C．采用高效节能的烧成技术

D．水泥粉磨采用预粉磨技术