要看后面的从句。
比如 the days ____ we spent 此时the day作从句中spent的宾语(we spent the days),引导词就用that(用which也可以)
在比如 the days ____ we studied together 此时the days在从句中应为时间状语的成分(we studied together in the days),故引导词用when]
(此时的when可相当于用the days in which we studied together或the days which we studied together in)
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