◎ 题干
At last, we found ourselves at the foot of a hill with trees providing shade and      ________  down to eat our picnic lunch.
A.sittingB.having sat
C.to sitD.sat
◎ 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“ At last, we found ourselves at the foot of a hill with trees providing shade and ________ down to eat our picnic lunch.A.sittingB.having satC.to sitD.sat…”主要考查了你对  【一般过去时】【一般过去时的被动语态】  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。