__ and short of breath, Andy and Ruby were the first to reach the top of the mountain.
A. to be tired
B. tired
C. tiring
D. being tired
查看答案
There's a man at the reception desk who seems very angry and I think he means __ trouble.
A. make
B. to make
C. making
D. made
数字设备公司(DEC公司)在年首先研制出世界上第一台可编程序控制器,型号为,并在的自动生产线上试用成功。
可编程序控制器是一种装置,专为在工业环境下应用而设计。