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【题目】Traveling ______a speed of 160 km/h,we have covered a distance of 120 kilometers ________less than 50 minutes.

A. with;in

B.at;in

C.with;for

D.at;for

【答案】B

【解析】at a speed of意为……的速度,表示具体的速度;in less than 50 minutes表示在不到50分钟的时间里

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