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

【答案】were having
【解析】句意是:當(dāng)我們正在吃完飯的時(shí)候,我聽(tīng)到有人在敲門(mén)。主句 I heard someone knocking on the door.的動(dòng)作是一般過(guò)去時(shí),As 引導(dǎo)的時(shí)間狀語(yǔ)從句的是過(guò)去正在進(jìn)行,用過(guò)去進(jìn)行時(shí),故填 were having。

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