问题描述：
I will never forget these days ①that we spent on the farm ②when we worked on the farm
I will never forget these days ①that /which/\we spent on the farm .
②when/on which we worked on the farm .
为什么连接词不同?
I will never forget these days ①that /which/\we spent on the farm .
②when/on which we worked on the farm .
为什么连接词不同?
问题解答：
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