题目内容：

at the time when/that

优质解答

这个得看具体情况来确定.1 如果定语从句中不缺少主语、宾语或表语,选择wheneg He came back home at the time when we were having dinner.2 如果定语从句中缺少主语、宾语或表语,选择thateg He came back home at t...