--I heard the high-speed train between Beijing and Tianjin ran 350 kilometers a hour.
--That’s right. I’m looking forward to it one day.
A. at; take B. at; taking C. by; take
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解析:句意:我听说北京到天津的高铁速度是350公里一小时。是对的,我期待有一天可以乘坐它。以…的速度,习惯用介词at, looking forward to 后接动名词,故选B