◎ 题干
Mr. Black has been teaching English in a middle school _____ he came to China.
A.for everB.ever sinceC.since thenD.long before
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Mr. Black has been teaching English in a middle school _____ he came to China. A.for everB.ever sinceC.since thenD.long before…”主要考查了你对  【并列连词】【从属连词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。