◎ 题干
While the boy ______ down the street, the UFO _____ .
A.was walking; was landing
B.walked; landed
C.was walking; landed
D.walked; was landing
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据魔方格专家分析,试题“While the boy ______ down the street, the UFO _____ . A.was walking; was landingB.walked; landedC.was walking; landedD.walked; was landing…”主要考查了你对  【一般现在时】【过去进行时】【过去完成进行时】  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。