【題目】Before you enter the room, you need to knock ________ the door politely.

A. for B. about C. with D. at

【答案】D

【解析】

句意:在你進(jìn)入房間前,你需要禮貌地敲門。短語knock at/on the door是固定搭配,意為敲門”,knock不與for/about/with等介詞搭配,故選D。

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