强调句的特殊疑问句式：
疑问词+ is (was) it + that +句子的其他成分，特殊疑问词即是被强调的成分。
例如：
Who was it that found your pen in the classroom yesterday?
昨天是谁在教室里找到你的钢笔的？
When was it that the Second World War broke out?
第二次世界大战是什么时候爆发的？
Where was it that you lost your cell phone?
你把手机丢在哪里了？
扩展资料：
Mary bought a new car. (非强调句)
It was Mary that bought a new car. (强调句型的陈述句形式)
是玛丽买了一辆新车
Was it Mary that bought a new car? (强调句型的一般疑问句形式)
是玛丽买了一辆新车吗？
Who was it that bought a new car? (强调句型的特殊疑问句形式)
是谁买了一辆新车？
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