6. There are over fifty ethnic groups but we all use Vietnamese as the official language.
A. Although there are over fifty ethnic groups, we all use Vietnamese as the official
language.
B. Despite there are over fifty ethnic groups, we all use Vietnamese as the official
C. However, there are over fifty ethnic groups, we all use Vietnamese as the official
D. In spite of using Vietnamese as the official language, there are over fifty ethnic
groups.
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