◎ 题干
It's polite to ________ the door before you go into the room.
[     ]
A. shout at        
B. knock on      
C. look at      
D. listen to
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“It's polite to ________ the door before you go into the room. [ ]A. shout atB. knock on C. look atD. listen to…”主要考查了你对  【动词短语】  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。