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问题: 一道英语单选题

It reached a speed of forty miles an hour. It__forty miles an hour.
A.ran B.ran with C.went at D.drove with
麻烦各位高手解释下,谢啦。。。。。

解答:

以什么速度应该使用 at
eg. at the speed of 120km/h
at a low speed
at a high speed