I still remember the days that i spent in beijing.that 为什么不可以换成when呢?

题目

I still remember the days that i spent in beijing.that 为什么不可以换成when呢?

答案

比句中I spent 后缺宾语用which或that来作关系代词,when是关系副词后跟一个完整的句子作从句的状语.