They were trying to remove harmful from cigarettes.A. contentB. substancesC. materialsD.

发布时间：2020-08-14 23:29:03

They were trying to remove harmful      from cigarettes.
A. content
B. substances
C. materials
D. mixtures

网友回答

A. content
(答案→)B. substances
C. materials
D. mixtures
解析：此处意思：物质，物体，B项有此意。
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