Mark was a student from 1999 to 2003,during which time he studied very hard此定语从句中的during which time 能不能换成during which.为什还要加个time

Mark was a student at this university from 1999 to 2003,____he studied very hard, Mark was a student at this university from 1999 to 2003,______ he studied very hard and was made Cfor which time不是也表示一段时间内吗Mark was a student at this university from 1999 to 2003,______ he studied very hard and was made Chairman Mark was a student at this university from 1999 to 2003,____he studied very hardA during which time 我想知道during which Mark was a student at this university from 1999 to 2003,____ ,he studied very hard and was made Chairman of the Students' Union.A.during which time B.for which time C.during whose time D.by that time Mark was a student at this university from 1999 to 2003,___he studied very hard and was为什么不能用during whose time . 急,请大虾们帮帮忙!四年的时间不可以看成是whosetime 吗？ 高一英语Mark was a student at this university from 1999 to 2003,______ heMark was a student at this university from 1999 to 2003,______ he studied very hard and was made Chairman of the Students' Union.A.during which timeB.for which time选哪个 So _____that we could hardly see it.A the mark was smallB samll was the markC samll the mark wasD was the mark small为什么? Mark was a student from 1999 to 2003,during which time he studied very hard此定语从句中的during which time 能不能换成during which.为什还要加个time I Was a Primary School student 中文 Read the passage and complete the student card.Then mark Then(T) or false (F).的意思 1．Last month ,part of Southeast Aisa was struck by floods,from _____effects the people are still suffering.A.that B.whose C.those2.Mark was a student at this university from 1999 to 2003,______he studied veryhard and was made Chairman of the Studen ?Ё写一段不少于80词的接续作文；Mark is a middle school student.he lives in a tall 英语小小问题Mark was a student at this university from 1990 to 1995,during which time he studied hard.为什么during后面用which?After the war,a new school building was put up where there had once been a theatre.这里 where there had once b 一道英语题(根据短文内容及首字母提示,在空白处填空)Mark Zurkerberg was born in a rich district in New York.He g__ his fist computer at the age of ten.W__ he was a student at Harvard University,he founded Facebook on February 4,20 问道定语从句的题目Mark was a student at this university from 1999 to 2003, __________ he studied very hard and was made Chairman of the Students’ Union. A. during which time B. for which time C. during whose time D. by that time 请教一个英语选择题（抄袭,灌水勿入,Mark was a student at this university from 1999 to 2003,_____ he studied very hard and was made chairman of the Students’ Union.A.during which time B.for which time C.during whose time D.by that tim 根据首字母完成短文所缺单词One day,the American w Mark Twin went to a city b train.He wanted to see a friend of h He was a very busy man and he often f something .When he in the train ,the conductor asked him f his ticket .Mark Twin looke 动词填空 something,return,police,break,able,information,picture,book,foolish,who,put,save Mark’s computer was stolen a few months ago,and he reported to the __1__.But the 18-year-old college student was very __2__ boy and he found the thief him