-- Who is dancing to music in the next room?-- the children.A. It isB. They areC. That is

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(答案→)A. It is
B. They are
C. That is
D. There are
解析：此题考查代词it 的用法。句意：在隔壁谁伴着音乐跳舞呢？是孩子们。在不知道性别或多少人，什么样的人等时，常用it 来代替。所以选A。