how fast does a car run?60 kilometers an hour,60 kilometers in an hour,at 60kilometers anhour

题目

how fast does a car run?60 kilometers an hour,60 kilometers in an hour,at 60kilometers anhour
at 60 kilometers in an hour 选择 说出理由

答案

选60 kilometers an hour,A.
at 用于“以……的速度”时,后面要有“速度”,at a speed of
因为它问的是“how fast does a car run?”强调fast,而B,强调一个小时走了60km