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求解中学英语语法题关系副词when在定语从句中作时间状语,书上有两个例句:I'll never forget the d

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求解中学英语语法题
关系副词when在定语从句中作时间状语,书上有两个例句:
I'll never forget the day when I joined the Party.
Summer is the season when many people often go swimming.
1.We will never forget the days __ we spent on the island.(答案which/that)
2.The woman will never forget the day __ they first met.which)
这两题矩形看起来和例句一样啊,为什么不是填when?第二句which前面为什么要加个on?
3.In the dark street,there wasn't a single person __ she could turn for help.whom,为什么有个to?)
4.She didn't manage to solve the problem __ you had explained how to do it.
A.unless B.until C.before (答案是until.但是我感觉unless和before的中文意思放进句子里也说得通呀,为什么不能用呢?如果要用unless和before,这句句型要怎么改?)
5.It must be snowing heavily,__ it is so bright outside.
6.The reason why he failed in the examination is __ he had not worked hard.
这两题都是选for,但是bcause和for都表示因为、由于,为什么不能用because?
第6题是that,
求解中学英语语法题关系副词when在定语从句中作时间状语,书上有两个例句:I'll never forget the d
1/2题.请牢记定语从句关系词的选择不是看现行词是时间,地点,还是原因,而是要看现行词在从句中要充当什么句子成分.这两题现行词虽然都是day,但是第1题中现行词the days在定语从句中作spent的宾语,故选which/that.而第2题中day在从句中充当met的时间状语,故选when(on which).
3.这个题涉及到介词加关系代词中,介词的选择问题.请根据从句动词和现行词之间的逻辑关系来选择.比如本题中从句里含有turn to sb. for help这个词组,你该明白为什么用to whom了吧?
4.这个题目unless=if ...not,替换到原句中,显然是错的,因为unless此时表达的是与过去事实相反的虚拟,而主句与之完全不匹配.正确的虚拟应该这么说:she couldn't have solved the problem unless you had explained how to do it
不过这个题目中的确是可以使用before的.尽管意思与not ...until有很细微出入,但是作为没有上限文语境的单句,应该认为是正确的.
5.前分句是Must推测用法,后面只能是针对推测而补充说明原因,填for(很多初学者会错填so)
6.the reason why.is that.“之所以.是因为."是英语中最常用句型之一,请牢记.
再问: on which=when?

英语老师,顺便帮我看看这个听力题呗,很短的。
http://zhidao.baidu.com/question/1766591442631607900.html