题目内容
【题目】—What is the noise?
— There must be someone k at the door.
【答案】knocking
【解析】句意：什么噪音？一定有人敲门。There must be someone doing一定有某人在做某事，结合句意，所以答案是knocking。
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题目内容
【题目】—What is the noise?
— There must be someone k at the door.
【答案】knocking
【解析】句意：什么噪音？一定有人敲门。There must be someone doing一定有某人在做某事，结合句意，所以答案是knocking。