◎ 题干
. —Why didn’t you response to their greeting?  
—Sorry. I ______they ______ to me.
A.don’t realize; are waving B.don’t realize; were waving
C.didn’t realize; were wavingD.didn’t realize; are waving
◎ 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“. —Why didn’t you response to their greeting?—Sorry. I ______they ______ to me.A.don’t realize; are waving B.don’t realize; were wavingC.didn’t realize…”主要考查了你对  【一般现在时】【将来进行时】【过去完成进行时】【过去将来时的被动语态】  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。