◎ 题干
I was doing some shopping in the supermarket ________ it suddenly occurred to me that I'd left
my wallet at home.
[     ]
A. when
B. while
C. until
D. 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“I was doing some shopping in the supermarket ________ it suddenly occurred to me that I'd leftmy wallet at home.[ ]A. when B. whileC. untilD. before…”主要考查了你对  【并列连词】  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。