【題目】Please knock at the door before （進(jìn)入）the room.

【答案】entering
【解析】句意：進(jìn)入房間前請(qǐng)敲門(mén)。before是介詞后接動(dòng)詞ing 形式。此處需要及物動(dòng)詞，故填entering。

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