Jack -------- at nine o'clock last Saturday evening.A slept B was sleeping请说明理由,

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Jack -------- at nine o'clock last Saturday evening.A slept B was sleeping请说明理由,
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Jack -------- at nine o'clock last Saturday evening.A slept B was sleeping请说明理由,
Jack -------- at nine o'clock last Saturday evening.A slept B was sleeping
请说明理由,

Jack -------- at nine o'clock last Saturday evening.A slept B was sleeping请说明理由,
选B,用过去进行时表示在过去某个时间正在做某事.这句话的意思是:杰克上周六晚上九点正睡觉.

A slept

A slept sleep是个瞬间动作,要么睡了要么没睡,不会正在睡。像go,come,leave,arrive,sleep,die这些动词不能表示“正在”,用于ing 形式都是表示“将要……”