Question

I have learned what a huge responsibility ____is

Answer 1

A it

原句：I have learned what a huge responsibility to raise a child is

it 形式主语代指了 to raise a child

意思：我终于明白抚养一个小孩长大是多么大的一份责任了

从 it is a huge responsibility to raise a child 变为感叹句的形式

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