◎ 题干
All of the guests ________ by 9 o'clock, but the host ________ until 15 minutes later.
[     ]
A. arrived; didn't show up    
B. had arrived; didn't show up
C. arrived; hadn't turned up    
D. had arrived; hadn't turned up
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“All of the guests ________ by 9 o'clock, but the host ________ until 15 minutes later.[ ]A. arrived; didn't show up B. had arrived; didn't show upC. arr…”主要考查了你对  【一般过去时】【过去完成时】  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。