本句結(jié)構(gòu)是：The time was a period所以,這里the time就是the period of time的意思,因此,后面的引導(dǎo)詞用when時(shí),可用：during the time替代,也就是during which]而且,先行詞是一段時(shí)間（不一定是time),又可以說(shuō)durin...四年和一分鐘不都是具體的時(shí)間嗎 為什么We are to study in this university for fouryears, during which we shall prepare ourselves well for the society不用during which time應(yīng)該是一段時(shí)間，不是具體時(shí)間。你可以說(shuō)：during one minute; 也可以說(shuō)：during the four years, 所以，可以用during which，因?yàn)閣hich就是代表先行詞的。倒是具體的時(shí)間點(diǎn)不用during,比如：5：15就是時(shí)間點(diǎn)，而不用的。還有某年也是。如：I never forget the year of 2008, in which the Beijing Olympic Games were held.可是一分鐘的時(shí)候又用during which time.這多一個(gè)time要怎么理解？一分鐘并不一定要用during which time的。He waited for us one minute, when(during which) we were in the teacher's office.