we can see that the length of time people spent at

问题补充：

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

答案：

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

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