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Thelastdayonyoushouldsendyourphotosis31thNovember.(这里是填that还是which?为什么?

题目详情
The last day on ____ you should send your photos is 31th November.(这里是填that还是which?为什么?
▼优质解答
答案和解析
which.that表达从句的时候,前面不能有介词的.on+which=when,in+which=where