Our physics teacher explained to us that light______faster than sound.A.is travelingB.trav

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Our physics teacher explained to us that light______faster than sound.

A.is traveling

B.traveled

C.travels

D.has traveled

请帮忙给出正确答案和分析,谢谢!

热搜:medline数据库中to字段是表示非英文文献的原文题名