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ashes from the volcano in Iceland have caused problems for air traffic and busin

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ashes from the volcano in Iceland have caused problems for air traffic and busin

_____ ashes from the volcano in Iceland have caused problems for air traffic and business, scientists don't think it will have long-term effects on human health.

A.Since

B.As

C.While

D.Because

试题答案

C

标签：forproblemscausedairbusiness

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