题目内容
In history, the Romany split into different groups and developed their own language, _______ there are now approximately sixty varieties.
A. by which B. of which C. by whom D. of whom
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题目内容
In history, the Romany split into different groups and developed their own language, _______ there are now approximately sixty varieties.
A. by which B. of which C. by whom D. of whom