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is known to everybody, light travels faster than sound. [ ] A.ItB.As C.WhichD.Wh

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is known to everybody, light travels faster than sound. [ ] A.ItB.As C.WhichD.Wh

________ is known to everybody, light travels faster than sound.

[]

A.ItB.AsC.WhichD.What

试题答案

答案:B