题目内容
() 16. —Listen!There someone at the door.
—It must be your sister.(2015山东青岛)
A. is;knocking B. is;knock
C. are; knocking D. are; knock
A
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题目内容
() 16. —Listen!There someone at the door.
—It must be your sister.(2015山东青岛)
A. is;knocking B. is;knock
C. are; knocking D. are; knock
A