When i went to see them ,the Turners __(have) their supper.

问题描述:

When i went to see them ,the Turners __(have) their supper.

were having
注:when引导的从句‘ 当一个动作发生( WENT) ,另一动作正在进行(过去进行时:THE TURNERS 作主语谓语动词用复数:were having )
加油!不明白再问!