◎ 题干
-What were you doing this time yesterday?
-I        on the grass and drawing a picture.
[     ]
A. sit
B. sat
C. am sitting
D. was sitting
◎ 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“-What were you doing this time yesterday?-Ion the grass and drawing a picture.[ ]A. sitB. satC. am sittingD. was sitting…”主要考查了你对  【过去进行时】  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。