It is（polite） to go into a person's room without knocking（敲）at the door first.

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1. (2021九上·麒麟月考) It is（polite） to go into a person's room without knocking（敲）at the door first.

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1. (2021九上·麒麟月考) It is（polite） to go into a person's room without knocking（敲）at the door first.