【題目】As we (have) dinner, I heard someone knocking on the door.

【答案】were having
【解析】句意是:當我們正在吃完飯的時候,我聽到有人在敲門。主句 I heard someone knocking on the door.的動作是一般過去時,As 引導的時間狀語從句的是過去正在進行,用過去進行時,故填 were having。

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