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【题目】It is ________ (有礼貌的) to knock on the door before entering a room.

【答案】polite

【解析】

句意:在进入房间之前敲门是有礼貌的。

“有礼貌的”在英文中表达为“polite”,it is +形容词+to do sth表示“做什么怎么样”,根据“It is ________ (有礼貌的) to knock on”及中文提示,可推测出此处是“polite”,故答案为polite

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