◎ 题干
— What _____ they doing?   
— They _____ studying.

A. are, are
B. is, is
C. was, are
D. are, do
◎ 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 _____they doing? — They _____ studying. [ ]A. are, are B. is, is C. was, are D. are, do …”主要考查了你对  【现在进行时】【主谓一致】  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。