【題目】He entered the room without p, so he was caught by the guard.

【答案】permission
【解析】句意：他未經(jīng)允許就進房間，因此他被門衛(wèi)捉住。前面有介詞without，故后面用名詞形式。without permission未經(jīng)允許。所以答案是permission。

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