高一英语（定语从句）高手进~用正确的介词+关系代词填空1,As is known to us all,the age_____ _____children can go to school is 7.2,Mrs Zhang often tells us that spring is the time_____ _____people often go sightseeing.3,He borrow

高一英语（定语从句）高手进~用正确的介词+关系代词填空1,As is known to us all,the age_____ _____children can go to school is 7.2,Mrs Zhang often tells us that spring is the time_____ _____people often go sightseeing.3,He borrow
高一英语（定语从句）高手进~
用正确的介词+关系代词填空
1,As is known to us all,the age_____ _____children can go to school is 7.
2,Mrs Zhang often tells us that spring is the time_____ _____people often go sightseeing.
3,He borrowed a book the other day,the author_____ _____is a worker.
4,Thank you for you help,_____ _____we could not have finished the work on time.
5,Do you remember the building_____ _____flew a fed flag all the year round?
6,The reason_____ _____I bought the roses is that Mary likes them.
7,He built a telescope_____ _____he could study the skies in hie free time.
哪位会这些题啊?请把答案和用法简单写一下.好的可以追加分数.谢谢.

高一英语（定语从句）高手进~用正确的介词+关系代词填空1,As is known to us all,the age_____ _____children can go to school is 7.2,Mrs Zhang often tells us that spring is the time_____ _____people often go sightseeing.3,He borrow
1.at which (at the age of...:在...岁的时候；还原句：Children can go to school at the age of 7；先行词为the age,关系代词为which,wihch替代the age)
2.during which (during the time:在这段期间；during spring:在春季；还原句：people often go sightseeing during spring/during the time of spring；先行词为the time,关系代词为which,wihch替代the time)
3.of which (the author of the book:该书作者；还原句：the author of the book is a worker；先行词为the book,关系代词为which,wihch替代the book)
4.without which (还原句：without your help we could not have finished the work on time；先行词为your help,关系代词为which,wihch替代your help)
5.on which (on the building:在楼顶；还原句：on the building flew a fed flag all the year round,先行词为the building,关系代词为which,wihch替代the building；这里flew a red flag为倒装用法,可还原成：a red flag flew all the year round on the building；)
6.for which (for the reason:因为该理由；还原句：I bought the roses for the reason that...；先行词为the reason,关系代词为which,wihch替代the reason)
7.with which (with sth.:通过使用...；还原句：he could study the skies with the telescope in hie free time,通过使用望远镜来研究风筝；先行词为the telescope,关系代词为which,wihch替代the telescope)