the children sat at the table until the guests __.A.left B had left

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the children sat at the table until the guests __.A.left B had left
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the children sat at the table until the guests __.A.left B had left
the children sat at the table until the guests __.A.left B had left

the children sat at the table until the guests __.A.left B had left
个人意见选择A.整个句子是说,孩子们一直在桌子边坐着直到所有的客人离开.had left表示的"已经走了",意思就变了.因为sat这里表示的状态,而需要一个时刻表示状态结束,这样left就可以做到

A