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The train was moving to the south of 150 miles an hour. [ ] A.at a speedB.on the

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The train was moving to the south of 150 miles an hour. [ ] A.at a speedB.on the

The train was moving to the south ________ of 150 miles an hour.

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A.at a speedB.on the speedC.at the speedD.at speeding

试题答案

答案:A