---Who is making so much noise?the children.A. There areB. They areC. That isD. It is

问题补充：

---Who is making so much noise?

--- the children.

A. There are

B. They are

C. That is

D. It is

答案：

A. There are

B. They are

C. That is

(答案→)D. It is

解析：句意：--谁在制造那么大的声音?—是那些孩子们。这里答语是省略句，完整的是It is the children that is making so much noise.这是强调句型，其结构是It was+被强调部分+ that+其他，判断强调句型的方法是把It was that去掉整个句子不缺成分，是成立的。故选D。