这个定语从句题

1Mr smith will never forget the days_____he spent with his students
A which B when C on which

2 It is a question that/which needs careful consideration （which/that 在句中作主语 是因为 needs careful consideration 差主语吗？）

Ａ，

是

1 . A

when引导定语从句，先行词是the days，因为在从句中作时间状语，所以只能用when

2 . 先行词是物时（a question ），由that/which 引导定语从句。needs是谓语动词，careful consideration 作宾语，缺少主语成分

第二题你括号里面说的可以算是对的。我们可以通过needs careful consideration 差主语来判断that/which 在从句做什么。

第一题，应该选A。因为在这里，the days 是spent的直接宾语。