He stayed there for quite a long time, during ___He stayed there for quite a long time, during ________ time he learned much spoken English. A．that B．this C．which D．same
选C，但是题目中为何还要再加一个time呢？during which中的which不就指时间嘛？
前后均有动词的句子，必须要选连词，排除B和D；
又因在介词后不能用that来引导定语从句，所以选C。
during which time指在那段时间里。
没有which就不是从句，全句就是2个动词。追问
读题了吗？
追答读解释了吗？没有which2个动词，懂？
追问什么？？？
追答这一句百分百必须加time.绝对把握。这是非常常见的固定用法。
追问为何？
追答which在从句里做定语修饰time
追问但是这还属于定语从句吗？
during which…on which…in which，不都是在句中做状语嘛
追答举个例子，IT stormed all day, during which time the ship broke up
追问his mom was our for a week，during which he was free.
为何有的不加time，有的加？
你说的是做定语，但是这样还叫定语从句吗？
就是固定用法。which表示那一个，那一段，是从句。
追问还是定语从句？
追答during which time就是在此期间的意思。固定用法。没有为什么。
追问你说是什么从句？？
追答定语从句
追问his mom was our for a week，during which he was free.
这句话为何不是这样？
during which time这个用法你可以查下字典。和词组的构成也差不多，哪有什么为什么。
这样吧，你查一下字典。这个例子在字典里还是很多的。手机码字说不清楚。
Half an hour passed, during which timethe ark had been slowly stealing overthe water.
半小时过去了，这时船在湖面上无声无息地缓缓滑行。
He stayed in Dublin for another year, during which time he met his future wife, Nora Barnacle.
他住在都柏林的又一年，在这期间，他会见了未来的妻子，诺拉巴纳克尔。
Thechildren were then followed up for an average of24 years of their continuing lives, during which time further parameters were monitored, as were any deaths in the group.
研究者继续跟踪研究了这些儿童的生活，每个平均跟踪了24年，期间更多的参数被监控，直到死亡。
你研究下这些例句
追问好的，我肯定会给你答复的，你放心。
句子没问题，当前面指代一段时间，during which和during which time都可以，但如果指代一个事件，一般只用during which。
当然，前提是，都是非限定性定从。追问
所以的during which都＝during which time？
追答如果指代a period of time的话
追问“指代一个事件，一般用during which”这是啥意思？
during which不是“在什么期间”做状语嘛？怎么还能指代事件呢？
给你几个网上的例子
1. a. I lived in Seoul for two years, during which I enjoyed the city. 正确
1 b. I lived in Seoul for two years, during which time I enjoyed the city 正确
2. a. The Korean War, during which many people were killed ended in 1953. 正确
2 b. The Korean War, during which time many people were killed ended in 1953.错误
He stayed there for quite a long time，and during that time he learned much spoken English如果是during which引导定语从句，不能再加 time这个词：
=He stayed there for quite a long time, during which he learned much spoken English追问
对！但这个题网上都是这样啊
是题出错了吗？
追答如果加上time 则which在定从中作定语。虽然不能算错，则属于多余。也许本题加time是为了增加选项的干扰程度。下面说法供参考：during which相当于during the time / the period / the course of …， 既可用于限制性定语从句也可用于非限制性定语从句，可指时间，也可指过程或阶段等，意为“在……期间；在……过程中；在……阶段”等。
during which time 相当于 during the time that/when + clause，只指时间，表示“在……期间”。
1. during which time通常用于非限制性定语从句，修饰前面主句，侧重点不在于主句中的时间名词，而是整个句子。如：
It took two years for me to get better, during which time he spoon-fed me and did absolutely everything around the house. 我过了两年时间才好起来，其间他喂我进食，并承担全部的家务。
说明：句中的during which time = and during the time when / that it took two years for me to get better 表“我过了两年时间才好起来”的整个过程。
He spent four years in college, during which time he studied medicine. 他上了四年大学，这期间他学了医学。
说明：句中的during which time = and during the time when / that he spent four years in college表“他上了四年大学”的整个过程。
2. during which time间或用于限制性定语从句，但仍是说明前面整个主句，所表达的还是非限制性定语从句的意义。如：
She lived for only seven weeks during which time her sister, Victoria, bought her a small teddy bear. 她只活了7周，在这期间，她的姐姐维多利亚给她买了一个小泰迪熊。
说明：句中的during which time = and during the time when / that she lived for only seven weeks表“她活了7周”这段时间。
