问题
选择题
— Who is knocking at the door?
— _______. [ ]
A. They are the children
B. There are the children
C. It is the children
D. That is the children
答案
答案：C
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— Who is knocking at the door?
— _______. [ ]
A. They are the children
B. There are the children
C. It is the children
D. That is the children
答案：C