填空I remember ( )this used to be a quiet village-Great changes have taken place here.-I remember ( ) this is used to be a quiet village.为什么填when,

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填空I remember ( )this used to be a quiet village
-Great changes have taken place here.-I remember ( ) this is used to be a quiet village.为什么填when,

when有"at that time"的意思的 比如:I was reading when my father came in.
求采纳