_relevant departments stressed no plasti...[高三][英语]
收录时间：2021-12-11 答题：高三英语（江老师）
【题目】_______relevant departments stressed no plastic covers were used for books, I didn't realize these covers contained harmful chemicals.
A.Until B.Unless C.While D.Since
【答案】A
【解析】
考查连词。句意：直到相关部门强调书不能使用塑料封面，我才意识到这些塑料封面含有有害的化学物质。A. Until直到；B. Unless 除非；C. While尽管；D. Since自从。分析句子可知，此处考查固定句型not…until…“直到……才……”，故选A项。
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