English,Chinese and French are the main languages at UNEnglish,Chinese and French are the main languages____at UN.A.using B.to use C.used D.uses选哪个?为什么?

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English,Chinese and French are the main languages at UNEnglish,Chinese and French are the main languages____at UN.A.using B.to use C.used D.uses选哪个?为什么?
English,Chinese and French are the main languages at UN
English,Chinese and French are the main languages____at UN.
A.using B.to use C.used D.uses
选哪个?为什么?

English,Chinese and French are the main languages at UNEnglish,Chinese and French are the main languages____at UN.A.using B.to use C.used D.uses选哪个?为什么?
C.used
这里是个定于从句,省略了Which are