The first teacher will never forget the days

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完整宾语从句
he spent the days with us
which 代指 the days
所以dwe worked on the farm in the days
when/ in which都行
状语从句请注意动词是否是及物动词或非及物动词
及物动词直接加宾语
非及物动词有介词
还有一些是短语
比如in the cinema 用where/ in which
这就便成状语从句了
======以下答案可供参考======
供参考答案1:
是定语从句，应该是he spent the days with us,the days直接在spent后面，所以只能填which,which指代the days,而选when时，when则是介词+days，不行，而during which也是介词加days，也不行
记住spent sometime with sth（sb）
供参考答案2:
D，定语从句