◎ 题干
I often hear him ______.Today when I pass(经过)the classroom, I hear him ______again .
A.sing; singingB.singing; sing
C.singing; singingD.sing; sing
◎ 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“I often hear him ______.Today when I pass(经过)the classroom, I hear him ______again .A.sing; singingB.singing; singC.singing; singingD.sing; sing…”主要考查了你对  【不定式】【分词】【动名词】  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。