一道高中英语语法题Could it have been on her birthday_______her parent

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一道高中英语语法题
Could it have been on her birthday_______her parents gave her this DV as a present?
空格里是填when还是that?为什么?
看大家都是各执一词的= =
填when的话是时间状从,定从?有on在可以这么用么?
填that的话是强调?但我记得强调只能是it is/was...
4L的说法,that修饰it,那么it指待什么,that在从句中充当什么成分呢?

that,转换过来是：
It could have been on her birthday that her parents gave her this DV as a prensent.
是强调句的格式,coule have been表示对过去的可能推测,完全可以转换为be动词形式.

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