In the domestic markets there may be only one seller.( )is c

In the domestic markets there may be only one seller.( )is c in some markets there may be only one seller.------ is calle In some markets there may be only one seller.____ is called there is only one student in the classroom .对one there is going to only be a country和there will only be one c 请问选择哪一个?there is only ( ) in the bag.A.a apple B.one apple C There is only one ball pen in the pencil box. There is only one book in the bag.(同义句) there is only one canteen in the factory If there is only one day in the world There is only one woman teacher in the office 对only one 提问 There is only one bird in the tree.中的only one部分提问