They were having a violent quarrel but______when I came in.A.broke upB.cut offC.broke offD

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They were having a violent quarrel but______when I came in.

A.broke up

B.cut off

C.broke off

D.hung up

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗