half an hour a___ ,we went home 根据说字母填空 交代原因

half an hour a___ ,we went home 根据说字母填空 交代原因
half an hour a___ ,we went home 根据说字母填空 交代原因

half an hour a___ ,we went home 根据说字母填空 交代原因
ago,
went 是过去式,前面的时间必然跟 过去式有联系,
half an hour ago,半个小时以前.