问题描述：
Who is making so much noise in the garden?
__ the children.
A. It is B. They are C. That is D. There are
Key: C
为什么啊?
四个选项怎么区别的?
__ the children.
A. It is B. They are C. That is D. There are
Key: C
为什么啊?
四个选项怎么区别的?
问题解答：
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