作业帮There was a time when parents who wanted ……为什么要用 whenThere was a time when parents who wanted an educational present for their children would buy a typewriter,a globe or an encyclopedia set.
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There was a time when parents who wanted ……为什么要用 whenThere was a time when parents who wanted an educational present for their children would buy a typewriter,a globe or an encyclopedia set.
There was a time when parents who wanted ……为什么要用 when
There was a time when parents who wanted an educational present for their children would buy a typewriter,a globe or an encyclopedia set.
There was a time when parents who wanted ……为什么要用 whenThere was a time when parents who wanted an educational present for their children would buy a typewriter,a globe or an encyclopedia set.
关系副词 when引导定语从句（包括限定性定语从句和非限定性定语从句）修饰表示时间的先行词,在定语从句中充当时间状语.例如：
I still remember the day when I first met Jennifer.我仍然记得第一次见到詹妮弗的那一天.
Next month,when you’ll spend your summer holidays in your hometown,is approaching.下个月即将来临,届时你们将在家乡度暑假.
when引导了一个限制性定语从句parents......set.，修饰先行词time。