ashes from the volcano in Iceland have caused problems for air traffic and business, scie

发布时间：2020-08-16 10:49:06


     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

网友回答

A. Since
B. As
(答案→)C. While
D. Because
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