改病句,Rose was at home at seven o’clock last night Where were

改病句,
Rose was at home at seven o'clock last night Where were you at same time?
I was in the coffee bar with my mother

Rose was at home at seven o'clock last night .罗斯昨晚七点钟在家.
Where were you【 then或者用 at that time】?当时你在哪里?
I was in the coffee bar with my mother.我和妈妈在咖啡厅.
一般来说不用：at the same time 在同时.常常用：then那时,当时,然后.
或者用 at that time在那时.