---Who is making so much noise?
--- the children.
A. There are
B. They are
C. That is
D. It is
网友回答
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。