3817Speakers are classified into two groups 查看材料A.that 2907

Speakers are classified into two groups 查看材料 A.that of a speech community B.can a speech community be formed C.in order to learn English better D.for the sake of simplicity E.has played an important role in the field of education F.is widely used in several areas of public activity 请帮忙给出正确答案和分析，谢谢！