--Do you know when it was that they got to know each other --It was last year___--Do you know when it was that they got to know each other --It was last year___they both taught in Scotland为什么填when,不填that?不是强调句吗?是不是因为

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--Do you know when it was that they got to know each other --It was last year___
--Do you know when it was that they got to know each other
--It was last year___they both taught in Scotland
为什么填when,不填that?不是强调句吗?是不是因为第一句有when的原因?

that 可省略,when不可省略.也就是后面后可可以写成It was last year that when they both taught in Scotland

问的是时间(Do you konw when)