who is making so much noise?it's/they are the children.选择原因

问题描述:

who is making so much noise?it's/they are the children.选择原因

who是不定代词,当作单数来用。
但是children是复数,不受问句影响,用they are。

they are the children
不要被前面一句话的谓语迷惑,只管看本句话的主谓宾,children是复数

选择it's
完整的是it's the children who are making so much noise.

选择they are
the children 是复数

强调句型选It is 回答省去了It is the children who/that are making so much noise

it's....
对应问句中的is
it's children who are making so muchu noise.

it's
因为我们并不知道是谁弄出来的噪音,所以不选they are.