对英语答案.

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对英语答案.对英语答案. 对英语答案.5.havetakenplaceC6.byaccidentA1.isdesigned2.arewidelyused3.wasusedto4.wereor

对英语答案.
对英语答案.

 

对英语答案.
5.have taken place C 6.by accident A
1.is designed
2.are widely used
3.was used to
4.were organized
5.All of the sudden
1.was turned