Who was ____called this morning?为什么用it that?

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Who was ____called this morning?为什么用it that?

it was who that called this morning.是对主语的强调句,又是对主语的疑问句.

因为这是一个强调句的特殊疑问句,原句是sb. called this morning, 变成强调句之后是It was sb. that called this morning.
对sb.提问,就变成了who was it that called this morning,也就是题中的句子了。