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

A. with；in

B．a(chǎn)t；in

C．with；for

D．a(chǎn)t；for

【答案】B

【解析】at a speed of意為“以……的速度”，表示具體的速度；in less than 50 minutes表示“在不到50分鐘的時(shí)間里”。

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