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when
eg 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that
eg He came back home at the time that we chose..
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when
eg 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that
eg He came back home at the time that we chose..