the sping festival is China's most important holiday when people journey home to be with families.the sping festival is China's most important holiday when people journey home to be with families为什么要用when?用 which 可以么？
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the sping festival is China's most important holiday when people journey home to be with families.the sping festival is China's most important holiday when people journey home to be with families为什么要用when?用 which 可以么？
the sping festival is China's most important holiday when people journey home to be with families.
the sping festival is China's most important holiday when people journey home to be with families
为什么要用when?
用 which 可以么？
the sping festival is China's most important holiday when people journey home to be with families.the sping festival is China's most important holiday when people journey home to be with families为什么要用when?用 which 可以么？
这是时间状语从句,when后面的句子是用来修饰 most important holiday的.不能用which
when 指代most important holiday 这个时间，要表达的意思是 在这段时间里人们干了什么
那春节是一个时间, 所以要用when.
春节是中国最重要的节日，那时人们回家和家人一起过。用when引导状语从句，which是“哪一个”的意思，总之讲不通。