◎ 题干
When my parrot is hungry, he _____ the cage_____ his beak.
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A. knocks on…in
B. knocks at…of
C. knocks on…with
D. knocks at…on
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“When my parrot is hungry, he _____ the cage_____ his beak. [ ]A. knocks on…in B. knocks at…of C. knocks on…with D. knocks at…on …”主要考查了你对  【动词短语】【介词】  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。