◎ 题干

—Have you seen your friend off ?
—Yes. I watched the train leaving the station        it disappeared from sight.
A.unlessB.as ifC.so thatD.until
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—Have you seen your friend off ?—Yes. I watched the train leaving the station it disappeared from sight.A.unlessB.as ifC.so thatD.until…”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。