◎ 题干
—What were you doing when you heard Malaysian airlines flight lost?
—I         my homework.
A.were doing.B.am doing.
C.was doing.D.is doing.
◎ 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 were you doing when you heard Malaysian airlines flight lost?—I my homework.A.were doing.B.am doing.C.was doing.D.is doing.…”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。