we can see that the length of time people spent at school was much greater in 1980people spent at school 前面是不是沈略了that,为什么可以沈略
网友回答
嗯 是省略了we can see that the length of time 【that】people spent at school was much greater in 1980
分解一下：people spent 【time】at school是宾语,定语从句的引导词that在从句中做宾语时可以省略
懂了吗?======以下答案可供参考======
供参考答案1:
因为它是做定语吧