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Listen!Hisfamilymustbequarrelling,?A.mustn'titB.isn'titC.aren'ttheyD.needn'tthey

题目详情
Listen! His family must be quarrelling, ____?
A.mustn't it    
B.isn't it    
C.aren't they    
D.needn't they
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答案和解析
C