他正在吃午饭，突然有人敲门。（was doing...when...）
He was having lunch when someone knocked at the door.
He was having lunch when someone knocked at the door.

【答案】He was having lunch when someone knocked at the door.

【解答】

【点评】

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发布：2024/6/27 10:35:59组卷：0引用：1难度：0.5

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他正在吃午饭，突然有人敲门。（was doing...when...）He was having lunch when someone knocked at the door.He was having lunch when someone knocked at the door.