◎ 题干
-- I called you this morning, but nobody answered it.
-- Oh, we ______ some shopping at the supermarket.
A.are doingB.were doing
C.have doneD.did
◎ 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 called you this morning, but nobody answered it.-- Oh, we ______ some shopping at the supermarket.A.are doingB.were doingC.have doneD.did…”主要考查了你对  【实义动词的单数第三人称形式】【实义动词】【动词短语】  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。