the book was written in 1946,-----the education system has s

the book was written in 1946,-----the education system has saw great changes.
答案用since when 为什么不用since which 代since 1946 ?since 是介词定语从句中不是要介词加关系代词的吗

晨曦怡 1年前已收到2个回答举报

713lhm 幼苗

共回答了16个问题采纳率：93.8% 举报

因为就像你说的一样是since1946,而which是不能指代时间,它可以指代某个人或某样东西但不能指代时间,而1946是个时间,能表示时间的只能是when所以用sincewhen

1年前

jsdxzhangnan326 幼苗

共回答了1个问题举报

因为1946是个年份，是时间。试想一下，对时间提问的话，你会用WHICH还是WHEN呢？当然使用WHEN，所以这里也用WHEN。
对，介词定于从句中是要介词加关系代词的。

1年前

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