◎ 题干
As they ____ through the nature park, they saw some squirrels, a gang of monkeys and two deer.

A. walked
B. were to walk
C. had walked
D. were walking
◎ 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“As they ____ through the nature park, they saw some squirrels, a gang of monkeys and two deer. [ ]A. walkedB. were to walk C. had walked D. were walking …”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。