He is driving a speed of 100 kilometers per hour A. inB. withC. atD. for

问题补充：

He is driving a speed of 100 kilometers per hour

A. in

B. with

C. at

D. for

答案：

A. in

B. with

(答案→)C. at

D. for

解析：考查介词辨析。Speed与介词at连用，构成at the speed of…的结构。句意：他以每小时100公里的速度开车。