【題目】 It’s polite to__________ the door first before you go into someone else’s room.

A. find out B. knock on

C. shout at D. look for

【答案】B

【解析】

試題分析：句意：你去其他人家之前先敲門是禮貌的。find out查明；knock on敲門；shout at對……大聲喊； look for尋找。此處表示敲門，故用短語knock on，故選B。

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