he disappeared last month, _________ we have heard nothing of him
AwhenBafterwhichCfromwhichDsincewhen选哪个？答案是d但是这里_________wehaveheardnothingofhim我认为是非...
A when B after which C from which D since when
选哪个？ 答案是d
但是这里_________ we have heard nothing of him 我认为是非限制性定语从句修饰last month 所以是since which 才对 如果选when就成了since in which（？）
难道这句话不是定语从句？ 展开
选哪个？ 答案是d
但是这里_________ we have heard nothing of him 我认为是非限制性定语从句修饰last month 所以是since which 才对 如果选when就成了since in which（？）
难道这句话不是定语从句？ 展开
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He disappeared last month, _________ we have heard nothing of him.
A when B after which C from which D since when
你说的是对的，这确实是个非限制性定于从句。最佳答案选D，但是这是一句很别扭的英语。
1. 非限制性定语从句中，which这个引导词可以指先行词，也可以指前面整个句子所陈述的事情。
“如果选when就成了since in which（？）”并不一定是这样的。我们说，where 常可以用"介词+which"来替换，但是这里的“介词”不一定就是in。如：
He climbed out of the chimney, where he had spent two hours.
=He climbed out of the chimney, (in which) he had spent two hours.（where 在烟囱里）
He fell down the tree, where he could see the star on the stage.
=He fell down from the chimney, (on which ) he could see the star on the stage. (where在烟囱上)
同理，when=介词+which的时候，不一定是in，有可能指的是from which，during which
而且，咱们一般不这样替换过来，而且也不是所有的都能替换，尤其是when。这里的when就指前面的时间last month
2. A答案里面when不引导非限制定于从句。B的after which 这里的which可以理解成“他上个月消失”这件事情。意思上，是正确的，但是后面用的完成时，since常用在完成时。C不对，
A when B after which C from which D since when
你说的是对的，这确实是个非限制性定于从句。最佳答案选D，但是这是一句很别扭的英语。
1. 非限制性定语从句中，which这个引导词可以指先行词，也可以指前面整个句子所陈述的事情。
“如果选when就成了since in which（？）”并不一定是这样的。我们说，where 常可以用"介词+which"来替换，但是这里的“介词”不一定就是in。如：
He climbed out of the chimney, where he had spent two hours.
=He climbed out of the chimney, (in which) he had spent two hours.（where 在烟囱里）
He fell down the tree, where he could see the star on the stage.
=He fell down from the chimney, (on which ) he could see the star on the stage. (where在烟囱上)
同理，when=介词+which的时候，不一定是in，有可能指的是from which，during which
而且，咱们一般不这样替换过来，而且也不是所有的都能替换，尤其是when。这里的when就指前面的时间last month
2. A答案里面when不引导非限制定于从句。B的after which 这里的which可以理解成“他上个月消失”这件事情。意思上，是正确的，但是后面用的完成时，since常用在完成时。C不对，
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关键是这里since不是介词 而when在这里是个名词对不对？
追答
when rel adv 关系副词
(used after time, day, month, etc 用於time﹑ day﹑ month等之後) at or on which 在那时; 其时:
Sunday is the day when very few people go to work. 星期日是没什麽人上班的日子.
* There are times when I wonder why I do this job. 有时候我也不明白我为什麽要做这个工作. * It was the sort of morning when everything goes wrong. 那天上午就是那样, 事事不顺心.
at which time; on which occasion 在那时; 当时; 当场: The Queen's last visit was in May, when she opened the new hospital. 女王上次来访是在五月份, 她那时主持了这座医院的落成典礼.
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