That is to say,there is only one class for each g________.All the class are mixed ones.

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Thatistosay,thereisonlyoneclassforeachg________.Alltheclassaremixedones.Thatistosay,thereisonlyonecl

That is to say,there is only one class for each g________.All the class are mixed ones.
That is to say,there is only one class for each g________.All the class are mixed ones.

That is to say,there is only one class for each g________.All the class are mixed ones.
That is to say,there is only one class for each grade.All the class are mixed ones.